Merge pull request #415 from anba/remove-runTestCase-finally

Replace runTestCase when used with try-finally

215 files changed, 599 insertions, 2153 deletions

diff --git a/test/built-ins/Object/create/15.2.3.5-4-10.js b/test/built-ins/Object/create/15.2.3.5-4-10.js
index 144db6c9b..b62c3b3c4 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-10.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-10.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.5-4-10
 description: >
     Object.create - argument 'Properties' is the Math object (15.2.3.7
     step 2)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var result = false;
         Object.defineProperty(Math, "prop", {
             get: function () {
@@ -21,11 +18,7 @@ function testcase() {
             configurable: true
         });
 
-        try {
             var newObj = Object.create({}, Math);
-            return result && newObj.hasOwnProperty("prop");
-        } finally {
-            delete Math.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(result, 'result !== true');
+assert(newObj.hasOwnProperty("prop"), 'newObj.hasOwnProperty("prop") !== true');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-117.js b/test/built-ins/Object/create/15.2.3.5-4-117.js
index 346af06db..0def02aaa 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-117.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-117.js
@@ -7,12 +7,8 @@ description: >
     Object.create - one property in 'Properties' is the Math object
     that uses Object's [[Get]] method to access the 'configurable'
     property (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             Math.configurable = true;
 
             var newObj = Object.create({}, {
@@ -23,9 +19,5 @@ function testcase() {
             delete newObj.prop;
             var result2 = newObj.hasOwnProperty("prop");
 
-            return result1 === true && result2 === false;
-        } finally {
-            delete Math.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(result1, true, 'result1');
+assert.sameValue(result2, false, 'result2');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-120.js b/test/built-ins/Object/create/15.2.3.5-4-120.js
index d561bb5d0..0ca99d135 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-120.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-120.js
@@ -7,12 +7,8 @@ description: >
     Object.create - one property in 'Properties' is the JSON object
     that uses Object's [[Get]] method to access the 'configurable'
     property (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             JSON.configurable = true;
 
             var newObj = Object.create({}, {
@@ -23,9 +19,5 @@ function testcase() {
             delete newObj.prop;
             var result2 = newObj.hasOwnProperty("prop");
 
-            return result1 === true && result2 === false;
-        } finally {
-            delete JSON.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(result1, true, 'result1');
+assert.sameValue(result2, false, 'result2');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-124.js b/test/built-ins/Object/create/15.2.3.5-4-124.js
index e380ba737..d22aee94f 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-124.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-124.js
@@ -7,14 +7,9 @@ description: >
     Object.create - one property in 'Properties' is the global object
     that uses Object's [[Get]] method to access the 'configurable'
     property (8.10.5 step 4.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
-        try {
             fnGlobalObject().configurable = true;
 
             var newObj = Object.create({}, {
@@ -25,9 +20,5 @@ function testcase() {
             delete newObj.prop;
             var result2 = newObj.hasOwnProperty("prop");
 
-            return result1 === true && result2 === false;
-        } finally {
-            delete fnGlobalObject().configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(result1, true, 'result1');
+assert.sameValue(result2, false, 'result2');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-13.js b/test/built-ins/Object/create/15.2.3.5-4-13.js
index 6aeabdb62..582f529fd 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-13.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-13.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.5-4-13
 description: >
     Object.create - argument 'Properties' is the JSON object (15.2.3.7
     step 2)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var result = false;
 
         Object.defineProperty(JSON, "prop", {
@@ -22,11 +19,7 @@ function testcase() {
             configurable: true
         });
 
-        try {
             var newObj = Object.create({}, JSON);
-            return result && newObj.hasOwnProperty("prop");
-        } finally {
-            delete JSON.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(result, 'result !== true');
+assert(newObj.hasOwnProperty("prop"), 'newObj.hasOwnProperty("prop") !== true');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-170.js b/test/built-ins/Object/create/15.2.3.5-4-170.js
index 02d511b2f..b3c650792 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-170.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-170.js
@@ -7,21 +7,12 @@ description: >
     Object.create - one property in 'Properties' is the Math object
     that uses Object's [[Get]] method to access the 'value' property
     (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             Math.value = "MathValue";
 
             var newObj = Object.create({}, {
                 prop: Math
             });
 
-            return newObj.prop === "MathValue";
-        } finally {
-            delete Math.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(newObj.prop, "MathValue", 'newObj.prop');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-173.js b/test/built-ins/Object/create/15.2.3.5-4-173.js
index eeb9d7d78..01a704169 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-173.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-173.js
@@ -7,21 +7,12 @@ description: >
     Object.create - one property in 'Properties' is the JSON object
     that uses Object's [[Get]] method to access the 'value' property
     (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             JSON.value = "JSONValue";
 
             var newObj = Object.create({}, {
                 prop: JSON
             });
 
-            return newObj.prop === "JSONValue";
-        } finally {
-            delete JSON.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(newObj.prop, "JSONValue", 'newObj.prop');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-177.js b/test/built-ins/Object/create/15.2.3.5-4-177.js
index 4fad22f25..d9e835efb 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-177.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-177.js
@@ -7,23 +7,13 @@ description: >
     Object.create - one property in 'Properties' is the global object
     that uses Object's [[Get]] method to access the 'value' property
     (8.10.5 step 5.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
-        try {
             fnGlobalObject().value = "GlobalValue";
 
             var newObj = Object.create({}, {
                 prop: fnGlobalObject()
             });
 
-            return newObj.prop === "GlobalValue";
-        } finally {
-            delete fnGlobalObject().value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(newObj.prop, "GlobalValue", 'newObj.prop');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-196.js b/test/built-ins/Object/create/15.2.3.5-4-196.js
index 6a254ac59..4a10a2d35 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-196.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-196.js
@@ -7,12 +7,8 @@ description: >
     Object.create - one property in 'Properties' is the Math object
     that uses Object's [[Get]] method to access the 'writable'
     property (8.10.5 step 6.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             Math.writable = true;
 
             var newObj = Object.create({}, {
@@ -25,9 +21,5 @@ function testcase() {
 
             var afterWrite = (newObj.prop === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Math.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-199.js b/test/built-ins/Object/create/15.2.3.5-4-199.js
index 77afd18ae..b0d111992 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-199.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-199.js
@@ -7,12 +7,8 @@ description: >
     Object.create - one property in 'Properties' is the JSON object
     that uses Object's [[Get]] method to access the 'writable'
     property (8.10.5 step 6.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             JSON.writable = true;
 
             var newObj = Object.create({}, {
@@ -25,9 +21,5 @@ function testcase() {
 
             var afterWrite = (newObj.prop === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete JSON.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-203.js b/test/built-ins/Object/create/15.2.3.5-4-203.js
index 99dfdc7b7..013ecb214 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-203.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-203.js
@@ -7,14 +7,9 @@ description: >
     Object.create - one property in 'Properties' is the global object
     that uses Object's [[Get]] method to access the 'writable'
     property (8.10.5 step 6.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
-        try {
             fnGlobalObject().writable = true;
 
             var newObj = Object.create({}, {
@@ -27,9 +22,5 @@ function testcase() {
 
             var afterWrite = (newObj.prop === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete fnGlobalObject().writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-251.js b/test/built-ins/Object/create/15.2.3.5-4-251.js
index 0e151bc1a..eceff600f 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-251.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-251.js
@@ -7,11 +7,8 @@ description: >
     Object.create - one property in 'Properties' is the Math object
     that uses Object's [[Get]] method to access the 'get' property
     (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Math.get = function () {
                 return "VerifyMathObject";
             };
@@ -20,9 +17,4 @@ function testcase() {
                 prop: Math 
             });
 
-            return newObj.prop === "VerifyMathObject";
-        } finally {
-            delete Math.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(newObj.prop, "VerifyMathObject", 'newObj.prop');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-252.js b/test/built-ins/Object/create/15.2.3.5-4-252.js
index a83e2bd45..e5cd76b90 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-252.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-252.js
@@ -7,22 +7,14 @@ description: >
     Object.create - one property in 'Properties' is the JSON object
     that uses Object's [[Get]] method to access the 'get' property
     (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         JSON.get = function () {
             return "VerifyJSONObject";
         };
 
-        try {
             var newObj = Object.create({}, {
                 prop: JSON 
             });
 
-            return newObj.prop === "VerifyJSONObject";
-        } finally {
-            delete JSON.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(newObj.prop, "VerifyJSONObject", 'newObj.prop');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-256.js b/test/built-ins/Object/create/15.2.3.5-4-256.js
index 1d7146537..6f35538fe 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-256.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-256.js
@@ -7,24 +7,15 @@ description: >
     Object.create - one property in 'Properties' is the global object
     that uses Object's [[Get]] method to access the 'get' property
     (8.10.5 step 7.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         fnGlobalObject().get = function () {
             return "VerifyGlobalObject";
         };
 
-        try {
             var newObj = Object.create({}, {
                 prop: fnGlobalObject()
             });
 
-            return newObj.prop === "VerifyGlobalObject";
-        } finally {
-            delete fnGlobalObject().get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(newObj.prop, "VerifyGlobalObject", 'newObj.prop');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-284.js b/test/built-ins/Object/create/15.2.3.5-4-284.js
index 53769b792..58777acf2 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-284.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-284.js
@@ -7,13 +7,10 @@ description: >
     Object.create - one property in 'Properties' is the Math object
     that uses Object's [[Get]] method to access the 'set' property
     (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
 
-        try {
             Math.set = function (value) {
                 data = value;
             };
@@ -26,9 +23,5 @@ function testcase() {
 
             newObj.prop = "overrideData";
 
-            return hasProperty && data === "overrideData";
-        } finally {
-            delete Math.set;
-        }
-    }
-runTestCase(testcase);
+assert(hasProperty, 'hasProperty !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-287.js b/test/built-ins/Object/create/15.2.3.5-4-287.js
index baa187b60..6057e68fb 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-287.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-287.js
@@ -7,13 +7,10 @@ description: >
     Object.create - one property in 'Properties' is the JSON object
     that uses Object's [[Get]] method to access the 'set' property
     (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
 
-        try {
             JSON.set = function (value) {
                 data = value;
             };
@@ -26,9 +23,5 @@ function testcase() {
 
             newObj.prop = "overrideData";
 
-            return hasProperty && data === "overrideData";
-        } finally {
-            delete JSON.set;
-        }
-    }
-runTestCase(testcase);
+assert(hasProperty, 'hasProperty !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-291.js b/test/built-ins/Object/create/15.2.3.5-4-291.js
index 4ffc2d5d3..b5d8d69e6 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-291.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-291.js
@@ -7,15 +7,11 @@ description: >
     Object.create - one property in 'Properties' is the global object
     that uses Object's [[Get]] method to access the 'set' property
     (8.10.5 step 8.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var data = "data";
 
-        try {
             fnGlobalObject().set = function (value) {
                 data = value;
             };
@@ -28,9 +24,5 @@ function testcase() {
 
             newObj.prop = "overrideData";
 
-            return hasProperty && data === "overrideData";
-        } finally {
-            delete fnGlobalObject().set;
-        }
-    }
-runTestCase(testcase);
+assert(hasProperty, 'hasProperty !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-33.js b/test/built-ins/Object/create/15.2.3.5-4-33.js
index 66d7d0feb..28684d926 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-33.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-33.js
@@ -7,20 +7,12 @@ description: >
     Object.create - 'Properties' is the Math object that uses Object's
     [[Get]] method to access own enumerable property (15.2.3.7 step
     5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             Math.prop = {
                 value: 12,
                 enumerable: true
             };
             var newObj = Object.create({}, Math);
-            return newObj.hasOwnProperty("prop");
-        } finally {
-            delete Math.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(newObj.hasOwnProperty("prop"), 'newObj.hasOwnProperty("prop") !== true');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-36.js b/test/built-ins/Object/create/15.2.3.5-4-36.js
index 09a48c2ef..f11823460 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-36.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-36.js
@@ -7,20 +7,12 @@ description: >
     Object.create - 'Properties' is the JSON object that uses Object's
     [[Get]] method to access own enumerable property (15.2.3.7 step
     5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             JSON.prop = {
                 value: 12,
                 enumerable: true
             };
             var newObj = Object.create({}, JSON);
-            return newObj.hasOwnProperty("prop");
-        } finally {
-            delete JSON.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(newObj.hasOwnProperty("prop"), 'newObj.hasOwnProperty("prop") !== true');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-64.js b/test/built-ins/Object/create/15.2.3.5-4-64.js
index 084b73b37..dcb8a6f23 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-64.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-64.js
@@ -7,14 +7,10 @@ description: >
     Object.create - one property in 'Properties' is the Math object
     that uses Object's [[Get]] method to access the 'enumerable'
     property (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var accessed = false;
 
-        try {
             Math.enumerable = true;
 
             var newObj = Object.create({}, {
@@ -25,9 +21,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete Math.enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-67.js b/test/built-ins/Object/create/15.2.3.5-4-67.js
index ba562de19..c9daddf94 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-67.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-67.js
@@ -7,14 +7,10 @@ description: >
     Object.create - one property in 'Properties' is the JSON object
     that uses Object's [[Get]] method to access the 'enumerable'
     property (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var accessed = false;
 
-        try {
             JSON.enumerable = true;
 
             var newObj = Object.create({}, {
@@ -25,9 +21,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete JSON.enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/create/15.2.3.5-4-71.js b/test/built-ins/Object/create/15.2.3.5-4-71.js
index c95e3f3c4..9d7dc1fcc 100644
--- a/test/built-ins/Object/create/15.2.3.5-4-71.js
+++ b/test/built-ins/Object/create/15.2.3.5-4-71.js
@@ -7,16 +7,11 @@ description: >
     Object.create - one property in 'Properties' is the global object
     that uses Object's [[Get]] method to access the 'enumerable'
     property (8.10.5 step 3.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
         var accessed = false;
 
-        try {
             fnGlobalObject().enumerable = true;
 
             var newObj = Object.create({}, {
@@ -27,9 +22,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete fnGlobalObject().enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-2-11.js b/test/built-ins/Object/defineProperties/15.2.3.7-2-11.js
index f80dde265..49e5f4208 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-2-11.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-2-11.js
@@ -4,15 +4,11 @@
 /*---
 es5id: 15.2.3.7-2-11
 description: Object.defineProperties - argument 'Properties' is the Math object
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
         var result = false;
-       
-        try {
+
             Object.defineProperty(Math, "prop", {
                 get: function () {
                     result = (this === Math);
@@ -23,9 +19,5 @@ function testcase() {
             });
 
             Object.defineProperties(obj, Math);
-            return result;
-        } finally {
-            delete Math.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(result, 'result !== true');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-2-14.js b/test/built-ins/Object/defineProperties/15.2.3.7-2-14.js
index bb72313cf..4cb5a056a 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-2-14.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-2-14.js
@@ -4,15 +4,11 @@
 /*---
 es5id: 15.2.3.7-2-14
 description: Object.defineProperties - argument 'Properties' is the JSON object
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
         var result = false;
 
-        try {
             Object.defineProperty(JSON, "prop", {
                 get: function () {
                     result = (this === JSON);
@@ -23,9 +19,5 @@ function testcase() {
             });
 
             Object.defineProperties(obj, JSON);
-            return result;
-        } finally {
-            delete JSON.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(result, 'result !== true');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-2-18.js b/test/built-ins/Object/defineProperties/15.2.3.7-2-18.js
index afd10e3f1..54d63f93e 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-2-18.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-2-18.js
@@ -6,13 +6,9 @@ es5id: 15.2.3.7-2-18
 description: >
     Object.defineProperties - argument 'Properties' is the global
     object
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
         var result = false;
 
@@ -27,11 +23,11 @@ function testcase() {
             });
 
             Object.defineProperties(obj, fnGlobalObject());
-            return result;
         } catch (e) {
-            return (e instanceof TypeError);
+            if (!(e instanceof TypeError)) throw e;
+            result = true;
         } finally {
             delete fnGlobalObject().prop;
         }
-    }
-runTestCase(testcase);
+
+assert(result, 'result !== true');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-a-12.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-a-12.js
index 22d61ff94..f13acf2b5 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-a-12.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-a-12.js
@@ -6,22 +6,14 @@ es5id: 15.2.3.7-5-a-12
 description: >
     Object.defineProperties - 'Properties' is the Math object which
     implements its own [[Get]] method to get enumerable own property
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
 
-        try {
             Math.prop = {
                 value: 12
             };
             Object.defineProperties(obj, Math);
 
-            return obj.hasOwnProperty("prop") && obj.prop === 12;
-        } finally {
-            delete Math.prop;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("prop"), 'obj.hasOwnProperty("prop") !== true');
+assert.sameValue(obj.prop, 12, 'obj.prop');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-a-15.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-a-15.js
index 910a260ec..07dc678c4 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-a-15.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-a-15.js
@@ -6,21 +6,14 @@ es5id: 15.2.3.7-5-a-15
 description: >
     Object.defineProperties - 'Properties' is the JSON object which
     implements its own [[Get]] method to get enumerable own property
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             JSON.prop = {
                 value: 15
             };
             Object.defineProperties(obj, JSON);
 
-            return obj.hasOwnProperty("prop") && obj.prop === 15;
-        } finally {
-            delete JSON.prop;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("prop"), 'obj.hasOwnProperty("prop") !== true');
+assert.sameValue(obj.prop, 15, 'obj.prop');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-130.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-130.js
index 93b8a9561..75eb5a7de 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-130.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-130.js
@@ -7,22 +7,14 @@ description: >
     Object.defineProperties - 'descObj' is the Math object which
     implements its own [[Get]] method to get 'value' property (8.10.5
     step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Math.value = "Math";
 
             Object.defineProperties(obj, {
                 property: Math
             });
 
-            return obj.property === "Math";
-        } finally {
-            delete Math.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Math", 'obj.property');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-133.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-133.js
index 809669eb3..75d124af0 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-133.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-133.js
@@ -7,22 +7,14 @@ description: >
     Object.defineProperties - 'descObj' is the JSON object which
     implements its own [[Get]] method to get 'value' property (8.10.5
     step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             JSON.value = "JSON";
 
             Object.defineProperties(obj, {
                 property: JSON
             });
 
-            return obj.property === "JSON";
-        } finally {
-            delete JSON.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "JSON", 'obj.property');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-137.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-137.js
index a48e632b2..00afd773f 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-137.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-137.js
@@ -7,24 +7,15 @@ description: >
     Object.defineProperties - 'descObj' is the global object which
     implements its own [[Get]] method to get 'value' property (8.10.5
     step 5.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             fnGlobalObject().value = "global";
 
             Object.defineProperties(obj, {
                 property: fnGlobalObject()
             });
 
-            return obj.property === "global";
-        } finally {
-            delete fnGlobalObject().value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "global", 'obj.property');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-156.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-156.js
index 107e823c3..c578ae4f7 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-156.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-156.js
@@ -13,7 +13,6 @@ includes: [propertyHelper.js]
 
 var obj = {};
 
-try {
     Math.writable = false;
 
     Object.defineProperties(obj, {
@@ -22,7 +21,3 @@ try {
 
     assert(obj.hasOwnProperty("property"));
     verifyNotWritable(obj, "property");
-
-} finally {
-    delete Math.writable;
-}
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-159.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-159.js
index c7d08c0a2..9bd06f4ef 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-159.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-159.js
@@ -12,7 +12,6 @@ includes: [propertyHelper.js]
 
 var obj = {};
 
-try {
     JSON.writable = false;
 
     Object.defineProperties(obj, {
@@ -21,8 +20,3 @@ try {
 
     assert(obj.hasOwnProperty("property"));
     verifyNotWritable(obj, "property");
-
-} finally {
-    delete JSON.writable;
-}
-
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-163.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-163.js
index 9806652a9..c508455ca 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-163.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-163.js
@@ -15,7 +15,6 @@ includes:
 
 var obj = {};
 
-try {
     fnGlobalObject().writable = false;
 
     Object.defineProperties(obj, {
@@ -24,9 +23,3 @@ try {
 
     assert(obj.hasOwnProperty("property"));
     verifyNotWritable(obj, "property");
-
-} finally {
-    delete fnGlobalObject().writable;
-}
-
-
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-209.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-209.js
index 1cd1a9b68..a4dec6de0 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-209.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-209.js
@@ -7,14 +7,10 @@ description: >
     Object.defineProperties - 'descObj' is the Math object which
     implements its own [[Get]] method to get 'get' property (8.10.5
     step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
 
-        try {
             Math.get = function () {
                 return "Math";
             };
@@ -23,9 +19,4 @@ function testcase() {
                 property: Math
             });
 
-            return obj.property === "Math";
-        } finally {
-            delete Math.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Math", 'obj.property');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-212.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-212.js
index 12cb398e1..75f7d4a49 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-212.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-212.js
@@ -7,14 +7,10 @@ description: >
     Object.defineProperties - 'descObj' is the JSON object which
     implements its own [[Get]] method to get 'get' property (8.10.5
     step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
 
-        try {
             JSON.get = function () {
                 return "JSON";
             };
@@ -23,9 +19,4 @@ function testcase() {
                 property: JSON
             });
 
-            return obj.property === "JSON";
-        } finally {
-            delete JSON.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "JSON", 'obj.property');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-216.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-216.js
index eb919238e..c68a95226 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-216.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-216.js
@@ -7,16 +7,11 @@ description: >
     Object.defineProperties - 'descObj' is the global object which
     implements its own [[Get]] method to get 'get' property (8.10.5
     step 7.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
 
-        try {
             fnGlobalObject().get = function () {
                 return "global";
             };
@@ -25,9 +20,4 @@ function testcase() {
                 property: fnGlobalObject()
             });
 
-            return obj.property === "global";
-        } finally {
-            delete fnGlobalObject().get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "global", 'obj.property');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-24.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-24.js
index fd15eac75..bab103cc6 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-24.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-24.js
@@ -7,15 +7,11 @@ description: >
     Object.defineProperties - 'descObj' is the Math object which
     implements its own [[Get]] method to get 'enumerable' property
     (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
         var accessed = false;
 
-        try {
             Math.enumerable = true;
 
             Object.defineProperties(obj, {
@@ -26,9 +22,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete Math.enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-244.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-244.js
index e002547ee..5324d0334 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-244.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-244.js
@@ -7,16 +7,13 @@ description: >
     Object.defineProperties - 'descObj' is the Math object which
     implements its own [[Get]] method to get 'set' property (8.10.5
     step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var data = "data";
         var setFun = function (value) {
             data = value;
         };
-        try {
+
             Math.prop = {
                 set: setFun
             };
@@ -24,9 +21,6 @@ function testcase() {
             var obj = {};
             Object.defineProperties(obj, Math);
             obj.prop = "mathData";
-            return obj.hasOwnProperty("prop") && data === "mathData";
-        } finally {
-            delete Math.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(obj.hasOwnProperty("prop"), 'obj.hasOwnProperty("prop") !== true');
+assert.sameValue(data, "mathData", 'data');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-247.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-247.js
index b43663fa1..c0815c7b0 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-247.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-247.js
@@ -7,16 +7,13 @@ description: >
     Object.defineProperties - 'descObj' is the JSON object which
     implements its own [[Get]] method to get 'set' property (8.10.5
     step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var data = "data";
         var setFun = function (value) {
             data = value;
         };
-        try {
+
             JSON.prop = {
                 set: setFun
             };
@@ -24,9 +21,6 @@ function testcase() {
             var obj = {};
             Object.defineProperties(obj, JSON);
             obj.prop = "JSONData";
-            return obj.hasOwnProperty("prop") && data === "JSONData";
-        } finally {
-            delete JSON.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(obj.hasOwnProperty("prop"), 'obj.hasOwnProperty("prop") !== true');
+assert.sameValue(data, "JSONData", 'data');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-27.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-27.js
index 7c99c4277..900b3b090 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-27.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-27.js
@@ -7,15 +7,11 @@ description: >
     Object.defineProperties - 'descObj' is the JSON object which
     implements its own [[Get]] method to get 'enumerable' property
     (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
         var accessed = false;
 
-        try {
             JSON.enumerable = true;
 
             Object.defineProperties(obj, {
@@ -26,9 +22,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete JSON.enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-31.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-31.js
index bead27b7f..7c1a48bc1 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-31.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-31.js
@@ -7,17 +7,12 @@ description: >
     Object.defineProperties - 'descObj' is the global object which
     implements its own [[Get]] method to get 'enumerable' property
     (8.10.5 step 3.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
         var accessed = false;
 
-        try {
             fnGlobalObject().enumerable = true;
 
             Object.defineProperties(obj, {
@@ -28,9 +23,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete fnGlobalObject().enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-77.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-77.js
index f3794aa35..44f498425 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-77.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-77.js
@@ -7,14 +7,10 @@ description: >
     Object.defineProperties - 'descObj' is the Math object which
     implements its own [[Get]] method to get 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
 
-        try {
             Math.configurable = true;
 
             Object.defineProperties(obj, {
@@ -25,9 +21,5 @@ function testcase() {
             delete obj.prop;
             var result2 = obj.hasOwnProperty("prop");
 
-            return result1 === true && result2 === false;
-        } finally {
-            delete Math.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(result1, true, 'result1');
+assert.sameValue(result2, false, 'result2');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-80.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-80.js
index a37654d68..99ab9c525 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-80.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-80.js
@@ -7,14 +7,10 @@ description: >
     Object.defineProperties - 'descObj' is the JSON object which
     implements its own [[Get]] method to get 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
 
-        try {
             JSON.configurable = true;
 
             Object.defineProperties(obj, {
@@ -25,9 +21,5 @@ function testcase() {
             delete obj.prop;
             var result2 = obj.hasOwnProperty("prop");
 
-            return result1 === true && result2 === false;
-        } finally {
-            delete JSON.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(result1, true, 'result1');
+assert.sameValue(result2, false, 'result2');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-84.js b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-84.js
index ceafc60be..e0babbe9d 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-5-b-84.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-5-b-84.js
@@ -7,16 +7,11 @@ description: >
     Object.defineProperties - 'descObj' is the global object which
     implements its own [[Get]] method to get 'configurable' property
     (8.10.5 step 4.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
-
         var obj = {};
 
-        try {
             fnGlobalObject().configurable = true;
 
             Object.defineProperties(obj, {
@@ -27,9 +22,5 @@ function testcase() {
             delete obj.prop;
             var result2 = obj.hasOwnProperty("prop");
 
-            return result1 === true && result2 === false;
-        } finally {
-            delete fnGlobalObject().configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(result1, true, 'result1');
+assert.sameValue(result2, false, 'result2');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-113.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-113.js
index bad68510e..e9286e341 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-113.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-113.js
@@ -7,14 +7,12 @@ description: >
     Object.defineProperties - 'O' is an Array, test the length
     property of 'O' is own data property that overrides an inherited
     data property (15.4.5.1 step 1)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arrProtoLen;
         var arr = [0, 1, 2];
-        try {
+
+assert.throws(TypeError, function() {
             arrProtoLen = Array.prototype.length;
             Array.prototype.length = 0;
 
@@ -25,14 +23,10 @@ function testcase() {
             Object.defineProperties(arr, {
                 length: { value: 1 }
             });
-            return false;
-        } catch (e) {
-            var desc = Object.getOwnPropertyDescriptor(arr, "length");
+});
 
-            return e instanceof TypeError && desc.value === 3 &&
-                desc.writable && !desc.enumerable && !desc.configurable;
-        } finally {
-            Array.prototype.length = arrProtoLen;
-        }
-    }
-runTestCase(testcase);
+var desc = Object.getOwnPropertyDescriptor(arr, "length");
+assert.sameValue(desc.value, 3, 'desc.value');
+assert(desc.writable, 'desc.writable !== true');
+assert.sameValue(desc.enumerable, false, 'desc.enumerable');
+assert.sameValue(desc.configurable, false, 'desc.configurable');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-167.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-167.js
index b92b05178..ac2bf4417 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-167.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-167.js
@@ -9,13 +9,10 @@ description: >
     of  the length property, test the [[Configurable]] attribute of
     inherited data property with large index named in 'O' can't stop
     deleting index named properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arr = [0, 1];
-        try {
+
             Array.prototype[1] = 2; //we are not allowed to set the [[Configurable]] attribute of property "1" to false here, since Array.prototype is a global object, and non-configurbale property can't revert to configurable
 
             Object.defineProperties(arr, {
@@ -24,9 +21,7 @@ function testcase() {
                 }
             });
 
-            return arr.length === 1 && !arr.hasOwnProperty("1") && arr[0] === 0 && Array.prototype[1] === 2;
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(arr.length, 1, 'arr.length');
+assert.sameValue(arr.hasOwnProperty("1"), false, 'arr.hasOwnProperty("1")');
+assert.sameValue(arr[0], 0, 'arr[0]');
+assert.sameValue(Array.prototype[1], 2, 'Array.prototype[1]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-168.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-168.js
index 98fb79d5b..c93f4a78e 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-168.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-168.js
@@ -10,13 +10,11 @@ description: >
     own data property with large index named in 'O' that overrides
     inherited data property can stop deleting index named properties
     (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-    
         var arr = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arr, "1", {
                 configurable: false
             });
@@ -28,12 +26,8 @@ function testcase() {
                     value: 1
                 }
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr.length === 2 &&
-                arr.hasOwnProperty("1") && arr[0] === 0 && arr[1] === 1;
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr.length, 2, 'arr.length');
+assert(arr.hasOwnProperty("1"), 'arr.hasOwnProperty("1") !== true');
+assert.sameValue(arr[0], 0, 'arr[0]');
+assert.sameValue(arr[1], 1, 'arr[1]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-169.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-169.js
index 0f956d96d..0b72ac3d6 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-169.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-169.js
@@ -10,13 +10,11 @@ description: >
     own data property with large index named in 'O' that overrides
     inherited accessor property can stop deleting index named
     properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-    
         var arr = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arr, "1", {
                 configurable: false
             });
@@ -33,13 +31,9 @@ function testcase() {
                     value: 1
                 }
             });
-
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr.length === 2 && arr.hasOwnProperty("1") &&
-                arr[0] === 0 && arr[1] === 1 && Array.prototype[1] === 2;
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr.length, 2, 'arr.length');
+assert(arr.hasOwnProperty("1"), 'arr.hasOwnProperty("1") !== true');
+assert.sameValue(arr[0], 0, 'arr[0]');
+assert.sameValue(arr[1], 1, 'arr[1]');
+assert.sameValue(Array.prototype[1], 2, 'Array.prototype[1]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-17.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-17.js
index c50f5a999..43bc0511b 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-17.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-17.js
@@ -6,12 +6,8 @@ es5id: 15.2.3.7-6-a-17
 description: >
     Object.defineProperties - 'O' is the Math object which implements
     its own [[GetOwnProperty]] method to get 'P' (8.12.9 step 1 )
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             Object.defineProperty(Math, "prop", {
                 value: 11,
                 writable: true,
@@ -24,9 +20,6 @@ function testcase() {
                     value: 12
                 }
             });
-            return hasProperty && Math.prop === 12;
-        } finally {
-            delete Math.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(hasProperty, 'hasProperty !== true');
+assert.sameValue(Math.prop, 12, 'Math.prop');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-171.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-171.js
index f18a60dc6..ca3db2cb9 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-171.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-171.js
@@ -9,13 +9,10 @@ description: >
     of  the length property, test the [[Configurable]] attribute of
     inherited accessor property with large index named in 'O' can't
     stop deleting index named properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arr = [0, 1];
-        try {
+
             Object.defineProperty(Array.prototype, "1", {
                 get: function () {
                     return 1;
@@ -29,9 +26,7 @@ function testcase() {
                 }
             });
 
-            return arr.length === 1 && !arr.hasOwnProperty("1") && arr[0] === 0 && Array.prototype[1] === 1;
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(arr.length, 1, 'arr.length');
+assert.sameValue(arr.hasOwnProperty("1"), false, 'arr.hasOwnProperty("1")');
+assert.sameValue(arr[0], 0, 'arr[0]');
+assert.sameValue(Array.prototype[1], 1, 'Array.prototype[1]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-172.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-172.js
index cc9e90c15..938699559 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-172.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-172.js
@@ -10,13 +10,11 @@ description: >
     own accessor property with large index named in 'O' that overrides
     inherited data property can stop deleting index named properties
     (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-    
         var arr = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arr, "1", {
                 get: function () {
                     return 2;
@@ -31,12 +29,8 @@ function testcase() {
                     value: 1
                 }
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr.length === 2 &&
-                arr.hasOwnProperty("1") && arr[0] === 0 && arr[1] === 2;
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr.length, 2, 'arr.length');
+assert(arr.hasOwnProperty("1"), 'arr.hasOwnProperty("1") !== true');
+assert.sameValue(arr[0], 0, 'arr[0]');
+assert.sameValue(arr[1], 2, 'arr[1]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-173.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-173.js
index 84fba667a..0664450db 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-173.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-173.js
@@ -10,13 +10,11 @@ description: >
     own accessor property with large index named in 'O' that overrides
     inherited accessor property can stop deleting index named
     properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arr = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arr, "1", {
                 get: function () {
                     return 1;
@@ -36,12 +34,9 @@ function testcase() {
                     value: 1
                 }
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr.length === 2 && arr.hasOwnProperty("1") &&
-                arr[0] === 0 && arr[1] === 1 && Array.prototype[1] === 2;
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr.length, 2, 'arr.length');
+assert(arr.hasOwnProperty("1"), 'arr.hasOwnProperty("1") !== true');
+assert.sameValue(arr[0], 0, 'arr[0]');
+assert.sameValue(arr[1], 1, 'arr[1]');
+assert.sameValue(Array.prototype[1], 2, 'Array.prototype[1]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-187.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-187.js
index 565775b9a..239da3b32 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-187.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-187.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.7-6-a-187
 description: >
     Object.defineProperties - 'O' is an Array, 'P' is an array index
     named property, 'P' is inherited data property  (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Array.prototype, "0", {
                 value: 11,
                 configurable: true
@@ -23,9 +20,7 @@ function testcase() {
                     configurable: false
                 }
             });
-            return arr.hasOwnProperty("0") && typeof arr[0] === "undefined" && Array.prototype[0] === 11;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+
+assert(arr.hasOwnProperty("0"), 'arr.hasOwnProperty("0") !== true');
+assert.sameValue(typeof arr[0], "undefined", 'typeof arr[0]');
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-188.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-188.js
index 604d12717..a5895c270 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-188.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-188.js
@@ -7,17 +7,16 @@ description: >
     Object.defineProperties - 'O' is an Array, 'P' is an array index
     named property, 'P' is own data property that overrides an
     inherited data property  (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+var arr = [];
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 value: 11,
                 configurable: true
             });
 
-            var arr = [];
             Object.defineProperty(arr, "0", {
                 value: 12,
                 configurable: false
@@ -28,11 +27,6 @@ function testcase() {
                     configurable: true
                 }
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr[0] === 12 && Array.prototype[0] === 11;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr[0], 12, 'arr[0]');
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-189.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-189.js
index 4828ac6a6..43dcd4991 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-189.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-189.js
@@ -7,11 +7,11 @@ description: >
     Object.defineProperties - 'O' is an Array, 'P' is an array index
     named property, 'P' is own data property that overrides an
     inherited accessor property  (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+var arr = [];
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 get: function () {
                     return 11;
@@ -19,7 +19,6 @@ function testcase() {
                 configurable: true
             });
 
-            var arr = [];
             Object.defineProperty(arr, "0", {
                 value: 12,
                 configurable: false
@@ -30,11 +29,6 @@ function testcase() {
                     configurable: true
                 }
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr[0] === 12 && Array.prototype[0] === 11;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr[0], 12, 'arr[0]');
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-191.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-191.js
index 7a43741be..c074029e5 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-191.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-191.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.7-6-a-191
 description: >
     Object.defineProperties - 'O' is an Array, 'P' is an array index
     property, 'P' is inherited accessor property  (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Array.prototype, "0", {
                 get: function () {
                     return 11;
@@ -28,9 +25,7 @@ function testcase() {
                     configurable: false
                 }
             });
-            return arr.hasOwnProperty("0") && arr[0] === 12 && Array.prototype[0] === 11;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+
+assert(arr.hasOwnProperty("0"), 'arr.hasOwnProperty("0") !== true');
+assert.sameValue(arr[0], 12, 'arr[0]');
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-192.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-192.js
index 38fdf6243..5c064cd64 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-192.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-192.js
@@ -7,17 +7,16 @@ description: >
     Object.defineProperties - 'O' is an Array, 'P' is an array index
     named property, 'P' is own accessor property that overrides an
     inherited data property (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+var arr = [];
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 value: 11,
                 configurable: true
             });
 
-            var arr = [];
             Object.defineProperty(arr, "0", {
                 get: function () {
                     return 12;
@@ -30,11 +29,6 @@ function testcase() {
                     configurable: true
                 }
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr[0] === 12 && Array.prototype[0] === 11;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr[0], 12, 'arr[0]');
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-193.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-193.js
index ec9694038..1f6f92161 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-193.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-193.js
@@ -7,11 +7,11 @@ description: >
     Object.defineProperties - 'O' is an Array, 'P' is an array index
     named property, 'P' is own accessor property that overrides an
     inherited accessor property  (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+var arr = [];
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 get: function () {
                     return 11;
@@ -19,7 +19,6 @@ function testcase() {
                 configurable: true
             });
 
-            var arr = [];
             Object.defineProperty(arr, "0", {
                 get: function () {
                     return 12;
@@ -32,11 +31,6 @@ function testcase() {
                     configurable: true
                 }
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arr[0] === 12 && Array.prototype[0] === 11;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arr[0], 12, 'arr[0]');
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
diff --git a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-20.js b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-20.js
index 6cba1a9c3..c6256b2e2 100644
--- a/test/built-ins/Object/defineProperties/15.2.3.7-6-a-20.js
+++ b/test/built-ins/Object/defineProperties/15.2.3.7-6-a-20.js
@@ -6,12 +6,8 @@ es5id: 15.2.3.7-6-a-20
 description: >
     Object.defineProperties - 'O' is a JSON object which implements
     its own [[GetOwnProperty]] method to get 'P' (8.12.9 step 1 )
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
-        try {
             Object.defineProperty(JSON, "prop", {
                 value: 11,
                 writable: true,
@@ -23,9 +19,6 @@ function testcase() {
                     value: 12
                 }
             });
-            return hasProperty && JSON.prop === 12;
-        } finally {
-            delete JSON.prop;
-        }
-    }
-runTestCase(testcase);
+
+assert(hasProperty, 'hasProperty !== true');
+assert.sameValue(JSON.prop, 12, 'JSON.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-139-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-139-1.js
index 55e12b421..dc4bb72be 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-139-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-139-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Function object which
     implements its own [[Get]] method to access the 'value' property
     of prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Function.prototype.value = "Function";
             var funObj = function (a, b) {
                 return a + b;
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", funObj);
 
-            return obj.property === "Function";
-        } finally {
-            delete Function.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Function", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-140-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-140-1.js
index 8ee35ecef..2427bce09 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-140-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-140-1.js
@@ -7,20 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is an Array object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Array.prototype.value = "Array";
             var arrObj = [1, 2, 3];
 
             Object.defineProperty(obj, "property", arrObj);
 
-            return obj.property === "Array";
-        } finally {
-            delete Array.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Array", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-141-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-141-1.js
index 0f3044492..7168b9b07 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-141-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-141-1.js
@@ -7,20 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is a String object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             String.prototype.value = "String";
             var strObj = new String("abc");
 
             Object.defineProperty(obj, "property", strObj);
 
-            return obj.property === "String";
-        } finally {
-            delete String.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "String", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-142-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-142-1.js
index c5f7def07..b7c70877d 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-142-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-142-1.js
@@ -7,20 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is a Boolean object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Boolean.prototype.value = "Boolean";
             var boolObj = new Boolean(true);
 
             Object.defineProperty(obj, "property", boolObj);
 
-            return obj.property === "Boolean";
-        } finally {
-            delete Boolean.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Boolean", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-143-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-143-1.js
index 0e69a8849..855177b2c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-143-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-143-1.js
@@ -7,20 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is a Number object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Number.prototype.value = "Number";
             var numObj = new Number(-2);
 
             Object.defineProperty(obj, "property", numObj);
 
-            return obj.property === "Number";
-        } finally {
-            delete Number.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Number", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-144-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-144-1.js
index 96bf1f211..2d38e639f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-144-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-144-1.js
@@ -7,20 +7,12 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.value = "Math";
 
             Object.defineProperty(obj, "property", Math);
 
-            return obj.property === "Math";
-        } finally {
-            delete Object.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Math", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-144.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-144.js
index 458e7457f..5a243de1c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-144.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-144.js
@@ -7,20 +7,12 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'value' property  (8.10.5
     step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Math.value = "Math";
 
             Object.defineProperty(obj, "property", Math);
 
-            return obj.property === "Math";
-        } finally {
-            delete Math.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Math", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-145-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-145-1.js
index 7c09699cf..738ae2d0e 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-145-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-145-1.js
@@ -7,20 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is a Date object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Date.prototype.value = "Date";
             var dateObj = new Date();
 
             Object.defineProperty(obj, "property", dateObj);
 
-            return obj.property === "Date";
-        } finally {
-            delete Date.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Date", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-146-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-146-1.js
index 4f34ea230..28fd27b9d 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-146-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-146-1.js
@@ -7,20 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is a RegExp object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             RegExp.prototype.value = "RegExp";
             var regObj = new RegExp();
 
             Object.defineProperty(obj, "property", regObj);
 
-            return obj.property === "RegExp";
-        } finally {
-            delete RegExp.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "RegExp", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-147-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-147-1.js
index e0809ac44..2a28c6b51 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-147-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-147-1.js
@@ -7,20 +7,12 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.value = "JSON";
 
             Object.defineProperty(obj, "property", JSON);
 
-            return obj.property === "JSON";
-        } finally {
-            delete Object.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "JSON", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-147.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-147.js
index 89985336f..5974a207b 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-147.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-147.js
@@ -7,20 +7,12 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'value' property  (8.10.5
     step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             JSON.value = "JSON";
 
             Object.defineProperty(obj, "property", JSON);
 
-            return obj.property === "JSON";
-        } finally {
-            delete JSON.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "JSON", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-148-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-148-1.js
index b891ea143..516717351 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-148-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-148-1.js
@@ -7,20 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is an Error object that uses
     Object's [[Get]] method to access the 'value' property of
     prototype object  (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Error.prototype.value = "Error";
             var errObj = new Error();
 
             Object.defineProperty(obj, "property", errObj);
 
-            return obj.property === "Error";
-        } finally {
-            delete Error.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "Error", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-149-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-149-1.js
index 94bae2563..7ce7e83e2 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-149-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-149-1.js
@@ -7,21 +7,14 @@ description: >
     Object.defineProperty - 'Attributes' is an Arguments object which
     implements its own [[Get]] method to access the 'value' property
     of prototype object (8.10.5 step 5.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Object.prototype.value = "arguments";
             var argObj = (function () { return arguments; })();
 
 
             Object.defineProperty(obj, "property", argObj);
 
-            return obj.property === "arguments";
-        } finally {
-            delete Object.prototype.value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "arguments", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-151.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-151.js
index ea7a65b54..13f2ce89d 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-151.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-151.js
@@ -7,22 +7,13 @@ description: >
     Object.defineProperty - 'Attributes' is the global object that
     uses Object's [[Get]] method to access the 'value' property
     (8.10.5 step 5.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             fnGlobalObject().value = "global";
 
             Object.defineProperty(obj, "property", fnGlobalObject());
 
-            return obj.property === "global";
-        } finally {
-            delete fnGlobalObject().value;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "global", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-165-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-165-1.js
index 9ca90dfff..2daa9523d 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-165-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-165-1.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Function object which
     implements its own [[Get]] method to access the 'writable'
     property of prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Function.prototype.writable = true;
             var funObj = function (a, b) {
                 return a + b;
@@ -27,9 +24,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Function.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-166-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-166-1.js
index 6dc54828a..66bc45603 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-166-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-166-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Array object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Array.prototype.writable = true;
             var arrObj = [1, 2, 3];
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Array.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-167-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-167-1.js
index 5c2aff8b2..e5227ee79 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-167-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-167-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a String object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             String.prototype.writable = true;
             var strObj = new String("abc");
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete String.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-168-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-168-1.js
index 5870b54ae..347024234 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-168-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-168-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Boolean object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Boolean.prototype.writable = true;
             var boolObj = new Boolean(true);
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Boolean.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-169-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-169-1.js
index b4a10345a..431adb9f6 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-169-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-169-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Number object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Number.prototype.writable = true;
             var numObj = new Number(-2);
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Number.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-170-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-170-1.js
index 0ac85bc90..bd586b4b1 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-170-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-170-1.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.writable = true;
 
             Object.defineProperty(obj, "property", Math);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Object.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-170.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-170.js
index 38bdebca8..d0d86774f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-170.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-170.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'writable' property  (8.10.5
     step 6.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Math.writable = true;
 
             Object.defineProperty(obj, "property", Math);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Math.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-172-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-172-1.js
index 444791cf8..abcd93fc0 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-172-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-172-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a RegExp object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             RegExp.prototype.writable = true;
 
             var regObj = new RegExp();
@@ -25,9 +23,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete RegExp.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-173-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-173-1.js
index 170c0bed6..78f95f7d2 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-173-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-173-1.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.writable = true;
 
             Object.defineProperty(obj, "property", JSON);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Object.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-173.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-173.js
index b488a8262..cb368f7d0 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-173.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-173.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'writable' property  (8.10.5
     step 6.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             JSON.writable = true;
 
             Object.defineProperty(obj, "property", JSON);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete JSON.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-174-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-174-1.js
index b17e2fcbd..073df7987 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-174-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-174-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Error object that uses
     Object's [[Get]] method to access the 'writable' property of
     prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Error.prototype.writable = true;
 
             var errObj = new Error();
@@ -25,9 +23,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Error.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-175-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-175-1.js
index 7a75d3321..cc32ea6b4 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-175-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-175-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Arguments object which
     implements its own [[Get]] method to access the 'writable'
     property of prototype object (8.10.5 step 6.b)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Object.prototype.writable = true;
 
             var argObj = (function () { return arguments; })();
@@ -25,9 +23,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete Object.prototype.writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-177.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-177.js
index 2452d47fc..dc5a0e6dd 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-177.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-177.js
@@ -7,15 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the global object that
     uses Object's [[Get]] method to access the 'writable' property
     (8.10.5 step 6.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             fnGlobalObject().writable = true;
 
             Object.defineProperty(obj, "property", fnGlobalObject());
@@ -26,9 +22,5 @@ function testcase() {
 
             var afterWrite = (obj.property === "isWritable");
 
-            return beforeWrite === true && afterWrite === true;
-        } finally {
-            delete fnGlobalObject().writable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeWrite, true, 'beforeWrite');
+assert.sameValue(afterWrite, true, 'afterWrite');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-218-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-218-1.js
index 7fd8a49ab..af3ba07d2 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-218-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-218-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Function object which
     implements its own [[Get]] method to access the 'get' property of
     prototype object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Function.prototype.get = function () {
                 return "functionGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", funObj);
 
-            return obj.property === "functionGetProperty";
-        } finally {
-            delete Function.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "functionGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-219-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-219-1.js
index 33c27f263..777e4b1e1 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-219-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-219-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Array object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Array.prototype.get = function () {
                 return "arrayGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", arrObj);
 
-            return obj.property === "arrayGetProperty";
-        } finally {
-            delete Array.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "arrayGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-220-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-220-1.js
index af410bfe6..12816889e 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-220-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-220-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a String object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             String.prototype.get = function () {
                 return "stringGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", strObj);
 
-            return obj.property === "stringGetProperty";
-        } finally {
-            delete String.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "stringGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-221-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-221-1.js
index 0d1f65127..5984602a4 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-221-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-221-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Boolean object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Boolean.prototype.get = function () {
                 return "booleanGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", boolObj);
 
-            return obj.property === "booleanGetProperty";
-        } finally {
-            delete Boolean.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "booleanGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-222-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-222-1.js
index 73dd3b73f..2782d5443 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-222-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-222-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Number object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Number.prototype.get = function () {
                 return "numberGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", numObj);
 
-            return obj.property === "numberGetProperty";
-        } finally {
-            delete Number.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "numberGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-223-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-223-1.js
index 4b2dc0f76..cb7c01393 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-223-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-223-1.js
@@ -7,22 +7,14 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.get = function () {
                 return "mathGetProperty";
             };
 
             Object.defineProperty(obj, "property", Math);
 
-            return obj.property === "mathGetProperty";
-        } finally {
-            delete Object.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "mathGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-223.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-223.js
index 2db97c35f..165f297a7 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-223.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-223.js
@@ -7,22 +7,14 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'get' property (8.10.5 step
     7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Math.get = function () {
                 return "mathGetProperty";
             };
 
             Object.defineProperty(obj, "property", Math);
 
-            return obj.property === "mathGetProperty";
-        } finally {
-            delete Math.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "mathGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-224-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-224-1.js
index cdf29528e..4e2957df9 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-224-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-224-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Date object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Date.prototype.get = function () {
                 return "dateGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", dateObj);
 
-            return obj.property === "dateGetProperty";
-        } finally {
-            delete Date.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "dateGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-225-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-225-1.js
index c8caf8bec..cac536761 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-225-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-225-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a RegExp object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             RegExp.prototype.get = function () {
                 return "regExpGetProperty";
             };
@@ -21,9 +19,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", regObj);
 
-            return obj.property === "regExpGetProperty";
-        } finally {
-            delete RegExp.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "regExpGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-226-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-226-1.js
index 910c8d443..63ccc8a3a 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-226-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-226-1.js
@@ -7,22 +7,14 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.get = function () {
                 return "jsonGetProperty";
             };
 
             Object.defineProperty(obj, "property", JSON);
 
-            return obj.property === "jsonGetProperty";
-        } finally {
-            delete Object.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "jsonGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-226.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-226.js
index 982a66756..404626ea1 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-226.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-226.js
@@ -7,22 +7,14 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'get' property (8.10.5 step
     7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             JSON.get = function () {
                 return "jsonGetProperty";
             };
 
             Object.defineProperty(obj, "property", JSON);
 
-            return obj.property === "jsonGetProperty";
-        } finally {
-            delete JSON.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "jsonGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-227-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-227-1.js
index a512eb5b2..3b694afa2 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-227-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-227-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Error object that uses
     Object's [[Get]] method to access the 'get' property of prototype
     object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Error.prototype.get = function () {
                 return "errorGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", errObj);
 
-            return obj.property === "errorGetProperty";
-        } finally {
-            delete Error.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "errorGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-228-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-228-1.js
index 602bd59f2..89b7ba7df 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-228-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-228-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Arguments object which
     implements its own [[Get]] method to access the 'get' property of
     prototype object (8.10.5 step 7.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Object.prototype.get = function () {
                 return "argumentGetProperty";
             };
@@ -20,9 +18,4 @@ function testcase() {
 
             Object.defineProperty(obj, "property", argObj);
 
-            return obj.property === "argumentGetProperty";
-        } finally {
-            delete Object.prototype.get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "argumentGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-230.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-230.js
index e5e6e3a49..a7dbfae0a 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-230.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-230.js
@@ -7,24 +7,15 @@ description: >
     Object.defineProperty - 'Attributes' is the global object that
     uses Object's [[Get]] method to access the 'get' property (8.10.5
     step 7.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             fnGlobalObject().get = function () {
                 return "globalGetProperty";
             };
 
             Object.defineProperty(obj, "property", fnGlobalObject());
 
-            return obj.property === "globalGetProperty";
-        } finally {
-            delete fnGlobalObject().get;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.property, "globalGetProperty", 'obj.property');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-248-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-248-1.js
index d346c55d7..4ff3487ad 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-248-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-248-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Function object which
     implements its own [[Get]] method to access the 'set' property of
     prototype object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
-        try {
+
             Function.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", funObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Function.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-249-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-249-1.js
index 6c1c71c29..12f19e894 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-249-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-249-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is an Array object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
-        try {
+
             Array.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", arrObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Array.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-250-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-250-1.js
index c61187c53..10055b5c8 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-250-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-250-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a String object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             String.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", strObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete String.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-251-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-251-1.js
index c28602cd3..6ea5a518d 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-251-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-251-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Boolean object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
-        try {
+
             Boolean.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", boolObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Boolean.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-252-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-252-1.js
index 1961cbddc..749f8bc33 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-252-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-252-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Number object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
-        try {
+
             Number.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", numObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Number.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-253-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-253-1.js
index acf887909..96622fe50 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-253-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-253-1.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
 
-        try {
             Object.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +19,5 @@ function testcase() {
             Object.defineProperty(obj, "property", Math);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Object.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-253.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-253.js
index d9e66b08f..322dfe1f0 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-253.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-253.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'set' property (8.10.5 step
     8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
 
-        try {
             Math.set = function (value) {
                 data = value;
             };
@@ -22,9 +19,5 @@ function testcase() {
             Object.defineProperty(obj, "property", Math);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Math.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-254-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-254-1.js
index 33b696c2a..9b3a47fe4 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-254-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-254-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Date object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
-        try {
+
             Date.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", dateObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Date.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-255-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-255-1.js
index 7d9ae4742..15c2b421e 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-255-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-255-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a RegExp object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
-        try {
+
             RegExp.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", regObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete RegExp.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-256-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-256-1.js
index 1512bc1f7..86747c4b8 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-256-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-256-1.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
 
-        try {
             Object.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +19,5 @@ function testcase() {
             Object.defineProperty(obj, "property", JSON);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Object.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-256.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-256.js
index da7043199..67353422e 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-256.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-256.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'set' property (8.10.5 step
     8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
 
-        try {
             JSON.set = function (value) {
                 data = value;
             };
@@ -22,9 +19,5 @@ function testcase() {
             Object.defineProperty(obj, "property", JSON);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete JSON.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-257-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-257-1.js
index 037898c4c..a0fe03339 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-257-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-257-1.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is an Error object that uses
     Object's [[Get]] method to access the 'set' property of prototype
     object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
 
-        try {
             Error.prototype.set = function (value) {
                 data = value;
             };
@@ -23,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", errObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Error.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-258-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-258-1.js
index 0d2215471..0b250f10f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-258-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-258-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is an Arguments object which
     implements its own [[Get]] method to access the 'set' property of
     prototype object (8.10.5 step 8.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
-        try {
+
             Object.prototype.set = function (value) {
                 data = value;
             };
@@ -22,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", argObj);
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete Object.prototype.set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-260.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-260.js
index 24c3df67f..ce66181c2 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-260.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-260.js
@@ -7,16 +7,12 @@ description: >
     Object.defineProperty - 'Attributes' is the global object that
     uses Object's [[Get]] method to access the 'set' property (8.10.5
     step 8.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var data = "data";
 
-        try {
             fnGlobalObject().set = function (value) {
                 data = value;
             };
@@ -24,9 +20,5 @@ function testcase() {
             Object.defineProperty(obj, "property", fnGlobalObject());
             obj.property = "overrideData";
 
-            return obj.hasOwnProperty("property") && data === "overrideData";
-        } finally {
-            delete fnGlobalObject().set;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("property"), 'obj.hasOwnProperty("property") !== true');
+assert.sameValue(data, "overrideData", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-33-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-33-1.js
index 74181ef23..17f152928 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-33-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-33-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Function object which
     implements its own [[Get]] method to access the 'enumerable'
     property of prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Function.prototype.enumerable = true;
             var fun = function () { };
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete Function.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-34-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-34-1.js
index b41c1fbb6..6a54cf172 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-34-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-34-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is an Array object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Array.prototype.enumerable = true;
             var arrObj = [];
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete Array.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-35-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-35-1.js
index 867bc4412..908e603b1 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-35-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-35-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a String object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             String.prototype.enumerable = true;
             var strObj = new String();
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete String.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-36-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-36-1.js
index f62fc229e..a385748a7 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-36-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-36-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Boolean object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Boolean.prototype.enumerable = true;
             var boolObj = new Boolean(true);
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete Boolean.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-37-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-37-1.js
index 8452d007f..d9e83be1f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-37-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-37-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Number object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Number.prototype.enumerable = true;
             var numObj = new Number(-2);
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete Number.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-38-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-38-1.js
index eddd64c11..c49dc19dc 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-38-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-38-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Object.prototype.enumerable = true;
 
             Object.defineProperty(obj, "property", Math);
@@ -23,9 +21,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete Object.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-38.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-38.js
index 65bad194f..ea7b3809f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-38.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-38.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'enumerable' property
     (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
 
-        try {
             Math.enumerable = true;
 
             Object.defineProperty(obj, "property", Math);
@@ -24,9 +21,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete Math.enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-39-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-39-1.js
index ac30e2ab2..54bc49d18 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-39-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-39-1.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is a Date object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
 
-        try {
             Date.prototype.enumerable = true;
             var dateObj = new Date();
 
@@ -25,9 +22,5 @@ function testcase() {
                     accessed = true;
                 }
             }
-            return accessed;
-        } finally {
-            delete Date.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-40-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-40-1.js
index 697f697f0..6f2548ffd 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-40-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-40-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is an RegExp object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             RegExp.prototype.enumerable = true;
             var regObj = new RegExp();
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete RegExp.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-41-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-41-1.js
index c871601d6..c53c41840 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-41-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-41-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Object.prototype.enumerable = true;
 
             Object.defineProperty(obj, "property", JSON);
@@ -24,9 +22,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete Object.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-41.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-41.js
index 381fb50bd..6475a5ceb 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-41.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-41.js
@@ -7,14 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'enumerable' property
     (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
 
-        try {
             JSON.enumerable = true;
 
             Object.defineProperty(obj, "property", JSON);
@@ -25,9 +22,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete JSON.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-42-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-42-1.js
index 4ce09b5e3..41e13499f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-42-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-42-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is an Error object that uses
     Object's [[Get]] method to access the 'enumerable' property of
     prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Error.prototype.enumerable = true;
             var errObj = new Error();
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete Error.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-43-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-43-1.js
index 7e0325f17..7a799db39 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-43-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-43-1.js
@@ -7,13 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is an Arguments object which
     implements its own [[Get]] method to access the 'enumerable'
     property of prototype object (8.10.5 step 3.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
-        try {
+
             Object.prototype.enumerable = true;
             var argObj = (function () { return arguments; })();
 
@@ -25,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete Object.prototype.enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-45.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-45.js
index ed034969f..114fcde60 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-45.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-45.js
@@ -7,16 +7,12 @@ description: >
     Object.defineProperty - 'Attributes' is the global object that
     uses Object's [[Get]] method to access the 'enumerable' property
     (8.10.5 step 3.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = {};
         var accessed = false;
 
-        try {
             fnGlobalObject().enumerable = true;
 
             Object.defineProperty(obj, "property", fnGlobalObject());
@@ -27,9 +23,4 @@ function testcase() {
                 }
             }
 
-            return accessed;
-        } finally {
-            delete fnGlobalObject().enumerable;
-        }
-    }
-runTestCase(testcase);
+assert(accessed, 'accessed !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-86-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-86-1.js
index 894f753f5..016698c0e 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-86-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-86-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Function object which
     implements its own [[Get]] method to access the 'configurable'
     property of prototype object (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Function.prototype.configurable = true;
             var funObj = function (a, b) {
                 return a + b;
@@ -26,9 +24,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Function.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-87-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-87-1.js
index 2b22af147..b28cb6881 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-87-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-87-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Array object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Array.prototype.configurable = true;
             var arrObj = [1, 2, 3];
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Array.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-88-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-88-1.js
index 374e43db0..c0708bbe1 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-88-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-88-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a String object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             String.prototype.configurable = true;
             var strObj = new String("abc");
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete String.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-89-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-89-1.js
index d5b1212f6..2ee6e1792 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-89-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-89-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Boolean object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Boolean.prototype.configurable = true;
             var boolObj = new Boolean(true);
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Boolean.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-90-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-90-1.js
index 4d9174d19..d867abbc6 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-90-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-90-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Number object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Number.prototype.configurable = true;
             var numObj = new Number(-2);
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Number.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-91-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-91-1.js
index 29f44fddc..2191b771e 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-91-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-91-1.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.configurable = true;
 
             Object.defineProperty(obj, "property", Math);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Object.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-91.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-91.js
index 9eb1e64dd..e87007a5a 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-91.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-91.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the Math object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Math.configurable = true;
 
             Object.defineProperty(obj, "property", Math);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Math.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-92-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-92-1.js
index 4a25c26e6..8665effb5 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-92-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-92-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is a Date object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Date.prototype.configurable = true;
             var dateObj = new Date();
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Date.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-93-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-93-1.js
index aed55e537..b34879406 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-93-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-93-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an RegExp object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             RegExp.prototype.configurable = true;
             var regObj = new RegExp();
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete RegExp.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-94-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-94-1.js
index e382a33f6..293602b42 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-94-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-94-1.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.configurable = true;
 
             Object.defineProperty(obj, "property", JSON);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Object.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-94.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-94.js
index ef9206b3d..f7cd3d9aa 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-94.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-94.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is the JSON object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             JSON.configurable = true;
 
             Object.defineProperty(obj, "property", JSON);
@@ -24,9 +21,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete JSON.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-95-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-95-1.js
index 8947f2118..28d5de387 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-95-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-95-1.js
@@ -7,12 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Error object that uses
     Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
-        try {
+
             Error.prototype.configurable = true;
             var errObj = new Error();
 
@@ -24,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Error.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-96-1.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-96-1.js
index 743adb650..53a448dd0 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-96-1.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-96-1.js
@@ -7,13 +7,10 @@ description: >
     Object.defineProperty - 'Attributes' is an Arguments object which
     implements its own [[Get]] method to access the 'configurable'
     property (8.10.5 step 4.a)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             Object.prototype.configurable = true;
             var argObj = (function () { return arguments; })();
 
@@ -25,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete Object.prototype.configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-3-98.js b/test/built-ins/Object/defineProperty/15.2.3.6-3-98.js
index 79c8a99e0..1bc8fe297 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-3-98.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-3-98.js
@@ -7,15 +7,11 @@ description: >
     Object.defineProperty - 'Attributes' is the global object that
     uses Object's [[Get]] method to access the 'configurable' property
     (8.10.5 step 4.a)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = {};
 
-        try {
             fnGlobalObject().configurable = true;
 
             Object.defineProperty(obj, "property", fnGlobalObject());
@@ -26,9 +22,5 @@ function testcase() {
 
             var afterDeleted = obj.hasOwnProperty("property");
 
-            return beforeDeleted === true && afterDeleted === false;
-        } finally {
-            delete fnGlobalObject().configurable;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(beforeDeleted, true, 'beforeDeleted');
+assert.sameValue(afterDeleted, false, 'afterDeleted');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-117.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-117.js
index f80cb5718..2fd599c0b 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-117.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-117.js
@@ -7,14 +7,12 @@ description: >
     Object.defineProperty - 'O' is an Array, test the length property
     of 'O' is own data property that overrides an inherited data
     property (15.4.5.1 step 1)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var arrObj = [0, 1, 2];
         var arrProtoLen;
 
-        try {
+assert.throws(TypeError, function() {
             arrProtoLen = Array.prototype.length;
             Array.prototype.length = 0;
 
@@ -26,11 +24,6 @@ function testcase() {
             Object.defineProperty(arrObj, "length", {
                 value: 1
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arrObj.length === 3 && Array.prototype.length === 0;
-        } finally {
-            Array.prototype.length = arrProtoLen;
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arrObj.length, 3, 'arrObj.length');
+assert.sameValue(Array.prototype.length, 0, 'Array.prototype.length');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-171.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-171.js
index b3c686930..29cef1594 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-171.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-171.js
@@ -9,20 +9,14 @@ description: >
     of  the length property, test the [[Configurable]] attribute of an
     inherited data property with large index named in 'O' can't stop
     deleting index named properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arrObj = [0, 1];
-        try {
+
             Array.prototype[1] = 2; // Not setting the [[Configurable]] attribute of property "1" to false here, since Array.prototype is a global object, and non-configurbale property can't revert to configurable
             Object.defineProperty(arrObj, "length", {
                 value: 1
             });
-            return arrObj.length === 1 && !arrObj.hasOwnProperty("1");
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+
+assert.sameValue(arrObj.length, 1, 'arrObj.length');
+assert.sameValue(arrObj.hasOwnProperty("1"), false, 'arrObj.hasOwnProperty("1")');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-172.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-172.js
index 94ee183d5..11e3ff7ff 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-172.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-172.js
@@ -10,13 +10,11 @@ description: >
     own data property with large index named in 'O' that overrides an
     inherited data property can stop deleting index named properties
     (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arrObj = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arrObj, "1", {
                 configurable: false
             });
@@ -25,11 +23,6 @@ function testcase() {
             Object.defineProperty(arrObj, "length", {
                 value: 1
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arrObj.length === 2 && arrObj.hasOwnProperty("1"); 
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arrObj.length, 2, 'arrObj.length');
+assert(arrObj.hasOwnProperty("1"), 'arrObj.hasOwnProperty("1") !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-173.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-173.js
index ed42fe598..27a85d434 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-173.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-173.js
@@ -10,13 +10,11 @@ description: >
     own data property with large index named in 'O' that overrides an
     inherited accessor property can stop deleting index named
     properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arrObj = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arrObj, "1", {
                 configurable: false
             });
@@ -31,12 +29,6 @@ function testcase() {
             Object.defineProperty(arrObj, "length", {
                 value: 1
             });
-
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arrObj.length === 2 && arrObj.hasOwnProperty("1");
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arrObj.length, 2, 'arrObj.length');
+assert(arrObj.hasOwnProperty("1"), 'arrObj.hasOwnProperty("1") !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-175.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-175.js
index 79b35f0d3..4e7d05ceb 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-175.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-175.js
@@ -9,13 +9,10 @@ description: >
     of  the length property, test the [[Configurable]] attribute of an
     inherited accessor property with large index named in 'O' can't
     stop deleting index named properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arrObj = [0, 1];
-        try {
+
             Object.defineProperty(Array.prototype, "1", {
                 get: function () {
                     return 1;
@@ -27,9 +24,5 @@ function testcase() {
                 value: 1
             });
 
-            return arrObj.length === 1 && !arrObj.hasOwnProperty("1");
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(arrObj.length, 1, 'arrObj.length');
+assert.sameValue(arrObj.hasOwnProperty("1"), false, 'arrObj.hasOwnProperty("1")');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-176.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-176.js
index 17dd6a3e4..4d1d9ac03 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-176.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-176.js
@@ -10,13 +10,11 @@ description: >
     own accessor property with large index named in 'O' that overrides
     an inherited data property can stop deleting index named
     properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arrObj = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arrObj, "1", {
                 get: function () {
                     return 2;
@@ -28,11 +26,6 @@ function testcase() {
             Object.defineProperty(arrObj, "length", {
                 value: 1
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arrObj.length === 2 && arrObj.hasOwnProperty("1"); 
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arrObj.length, 2, 'arrObj.length');
+assert(arrObj.hasOwnProperty("1"), 'arrObj.hasOwnProperty("1") !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-177.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-177.js
index f3cef92f5..f9c666b27 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-177.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-177.js
@@ -10,13 +10,11 @@ description: >
     own accessor property with large index named in 'O' that overrides
     an inherited accessor property can stop deleting index named
     properties (15.4.5.1 step 3.l.ii)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-
         var arrObj = [0, 1];
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(arrObj, "1", {
                 get: function () {
                     return 1;
@@ -34,11 +32,6 @@ function testcase() {
             Object.defineProperty(arrObj, "length", {
                 value: 1
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && arrObj.length === 2 && arrObj.hasOwnProperty("1"); 
-        } finally {
-            delete Array.prototype[1];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(arrObj.length, 2, 'arrObj.length');
+assert(arrObj.hasOwnProperty("1"), 'arrObj.hasOwnProperty("1") !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-192.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-192.js
index c99967e9f..5e28dc2d3 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-192.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-192.js
@@ -8,17 +8,16 @@ description: >
     named property, 'name' is own data property that overrides an
     inherited data property, test TypeError is thrown on updating the
     [[Configurable]] attribute from false to true (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+var arrObj = [];
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 value: 11,
                 configurable: true
             });
 
-            var arrObj = [];
             Object.defineProperty(arrObj, "0", {
                 value: 12,
                 configurable: false
@@ -27,11 +26,6 @@ function testcase() {
             Object.defineProperty(arrObj, "0", {
                 configurable: true
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && Array.prototype[0] === 11 && arrObj[0] === 12;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
+assert.sameValue(arrObj[0], 12, 'arrObj[0]');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-193.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-193.js
index c7ea6830d..03c38b4db 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-193.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-193.js
@@ -10,11 +10,11 @@ description: >
     the [[Configurable]] attribute to true and value of
     [[Configurable]] attribute of original is false  (15.4.5.1 step
     4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+var arrObj = [];
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 get: function () {
                     return 11;
@@ -22,7 +22,6 @@ function testcase() {
                 configurable: true
             });
 
-            var arrObj = [];
             Object.defineProperty(arrObj, "0", {
                 value: 12,
                 configurable: false
@@ -31,11 +30,6 @@ function testcase() {
             Object.defineProperty(arrObj, "0", {
                 configurable: true
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError && Array.prototype[0] === 11 && arrObj[0] === 12;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
+assert.sameValue(Array.prototype[0], 11, 'Array.prototype[0]');
+assert.sameValue(arrObj[0], 12, 'arrObj[0]');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-196.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-196.js
index f6ee1a4cc..7ddb2e1dd 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-196.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-196.js
@@ -7,11 +7,10 @@ description: >
     Object.defineProperty - 'O' is an Array, 'name' is an array index
     named property, 'name' is own accessor property that overrides an
     inherited data property (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 value: 11,
                 configurable: true
@@ -26,11 +25,4 @@ function testcase() {
             Object.defineProperty(arrObj, "0", {
                 configurable: true
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-197.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-197.js
index 0dfdf81c9..4fc4f1e83 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-197.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-197.js
@@ -7,11 +7,10 @@ description: >
     Object.defineProperty - 'O' is an Array, 'name' is an array index
     named property, 'name' is own accessor property that overrides an
     inherited accessor property (15.4.5.1 step 4.c)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
+
+assert.throws(TypeError, function() {
             Object.defineProperty(Array.prototype, "0", {
                 get: function () { },
                 configurable: true
@@ -26,11 +25,4 @@ function testcase() {
             Object.defineProperty(arrObj, "0", {
                 configurable: true
             });
-            return false;
-        } catch (e) {
-            return e instanceof TypeError;
-        } finally {
-            delete Array.prototype[0];
-        }
-    }
-runTestCase(testcase);
+});
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-354-8.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-354-8.js
index fd80a39e1..af11b7433 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-354-8.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-354-8.js
@@ -13,7 +13,7 @@ includes:
 ---*/
 
 var obj = fnGlobalObject();
-try {
+
     Object.defineProperty(obj, "prop", {
         value: 2010,
         writable: false,
@@ -24,7 +24,3 @@ try {
     assert.sameValue(obj.prop, 2010);
     verifyNotWritable(obj, "prop");
     assert.sameValue(obj.prop, 2010);
-} finally {
-    delete obj.prop;
-}
-
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-360-3.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-360-3.js
index 1aa14ab70..b1cdb7890 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-360-3.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-360-3.js
@@ -14,7 +14,7 @@ includes:
 ---*/
 
 var obj = fnGlobalObject();
-try {
+
     Object.defineProperty(obj, "prop", {
         value: 2010,
         writable: false,
@@ -38,6 +38,3 @@ try {
     assert.sameValue(obj.prop, 20);
     assert.sameValue(typeof desc2.set, "undefined");
     assert.sameValue(desc2.get, getFunc);
-} finally {
-    delete obj.prop;
-}
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-402.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-402.js
index 976842919..1ef35f2bc 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-402.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-402.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.6-4-402
 description: >
     ES5 Attributes - [[Value]] attribute of inherited property of
     [[Prototype]] internal property is correct (String instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(String.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -19,9 +16,5 @@ function testcase() {
             });
             var strObj = new String();
 
-            return !strObj.hasOwnProperty("prop") && strObj.prop === 1001;
-        } finally {
-            delete String.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(strObj.hasOwnProperty("prop"), false, 'strObj.hasOwnProperty("prop")');
+assert.sameValue(strObj.prop, 1001, 'strObj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-403.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-403.js
index c19ec0616..989f5d5e9 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-403.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-403.js
@@ -7,11 +7,8 @@ description: >
     ES5 Attributes - Successfully add a property to an object when the
     object's prototype has a property with same name and [[Writable]]
     attribute is set to true (Array instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Array.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -21,9 +18,5 @@ function testcase() {
             var arrObj = [];
             arrObj.prop = 1002;
 
-            return arrObj.hasOwnProperty("prop") && arrObj.prop === 1002;
-        } finally {
-            delete Array.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert(arrObj.hasOwnProperty("prop"), 'arrObj.hasOwnProperty("prop") !== true');
+assert.sameValue(arrObj.prop, 1002, 'arrObj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-404.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-404.js
index c65cd138d..5cd579892 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-404.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-404.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.6-4-404
 description: >
     ES5 Attributes - Inherited property whose [[Enumerable]] attribute
     is set to true is enumerable (Boolean instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Boolean.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -26,9 +23,5 @@ function testcase() {
                 }
             }
 
-            return !boolObj.hasOwnProperty("prop") && verifyEnumerable;
-        } finally {
-            delete Boolean.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(boolObj.hasOwnProperty("prop"), false, 'boolObj.hasOwnProperty("prop")');
+assert(verifyEnumerable, 'verifyEnumerable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-405.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-405.js
index 7ff234090..3f7a50438 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-405.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-405.js
@@ -10,7 +10,6 @@ description: >
 includes: [propertyHelper.js]
 ---*/
 
-try {
     Object.defineProperty(Number.prototype, "prop", {
         value: 1001,
         writable: false,
@@ -22,7 +21,3 @@ try {
 
     assert(!numObj.hasOwnProperty("prop"));
     verifyNotWritable(numObj, "prop", "noCheckOwnProp");
-} finally {
-    delete Number.prototype.prop;
-}
-
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-406.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-406.js
index cd6ece4e6..25ede11d5 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-406.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-406.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.6-4-406
 description: >
     ES5 Attributes - Inherited property whose [[Enumerable]] attribute
     is set to false is non-enumerable (Function instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Function.prototype, "prop", {
                 value: 1001,
                 writable: false,
@@ -26,9 +23,5 @@ function testcase() {
                 }
             }
 
-            return !funObj.hasOwnProperty("prop") && !verifyEnumerable;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(funObj.hasOwnProperty("prop"), false, 'funObj.hasOwnProperty("prop")');
+assert.sameValue(verifyEnumerable, false, 'verifyEnumerable');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-407.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-407.js
index 4e4f2555b..eeabd495e 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-407.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-407.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.6-4-407
 description: >
     ES5 Attributes - [[Value]] attribute of inherited property of
     [[Prototype]] internal property is correct (Error Instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Error.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -19,9 +16,5 @@ function testcase() {
             });
             var errObj = new Error();
 
-            return !errObj.hasOwnProperty("prop") && errObj.prop === 1001;
-        } finally {
-            delete Error.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(errObj.hasOwnProperty("prop"), false, 'errObj.hasOwnProperty("prop")');
+assert.sameValue(errObj.prop, 1001, 'errObj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-408.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-408.js
index f25895f32..c1223a55c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-408.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-408.js
@@ -7,11 +7,8 @@ description: >
     ES5 Attributes - Successfully add a property to an object when the
     object's prototype has a property with same name and [[Writable]]
     attribute is set to true (Date instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Date.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -21,9 +18,5 @@ function testcase() {
             var dateObj = new Date();
             dateObj.prop = 1002;
 
-            return dateObj.hasOwnProperty("prop") && dateObj.prop === 1002;
-        } finally {
-            delete Date.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert(dateObj.hasOwnProperty("prop"), 'dateObj.hasOwnProperty("prop") !== true');
+assert.sameValue(dateObj.prop, 1002, 'dateObj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-409.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-409.js
index 2b48ac1e0..8dd96da0b 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-409.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-409.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.6-4-409
 description: >
     ES5 Attributes - Inherited property whose [[Enumerable]] attribute
     is set to false is enumerable (RegExp instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(RegExp.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -26,9 +23,5 @@ function testcase() {
                 }
             }
 
-            return !regObj.hasOwnProperty("prop") && verifyEnumerable;
-        } finally {
-            delete RegExp.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(regObj.hasOwnProperty("prop"), false, 'regObj.hasOwnProperty("prop")');
+assert(verifyEnumerable, 'verifyEnumerable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-410.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-410.js
index be87243a7..7c7a84256 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-410.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-410.js
@@ -10,7 +10,6 @@ description: >
 includes: [propertyHelper.js]
 ---*/
 
-try {
     Object.defineProperty(Object.prototype, "prop", {
         value: 1001,
         writable: false,
@@ -21,8 +20,3 @@ try {
     assert(!JSON.hasOwnProperty("prop"));
     verifyNotWritable(JSON, "prop", "noCheckOwnProp");
     assert.sameValue(JSON.prop, 1001);
-
-} finally {
-    delete Object.prototype.prop;
-}
-
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-411.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-411.js
index c22e5c0f3..b8d82ce40 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-411.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-411.js
@@ -6,11 +6,8 @@ es5id: 15.2.3.6-4-411
 description: >
     ES5 Attributes - Inherited property whose [[Enumerable]] attribute
     is set to false is non-enumerable (Math)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
-        try {
             Object.defineProperty(Object.prototype, "prop", {
                 value: 1001,
                 writable: false,
@@ -25,9 +22,5 @@ function testcase() {
                 }
             }
 
-            return !Math.hasOwnProperty("prop") && !verifyEnumerable;
-        } finally {
-            delete Object.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(Math.hasOwnProperty("prop"), false, 'Math.hasOwnProperty("prop")');
+assert.sameValue(verifyEnumerable, false, 'verifyEnumerable');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-417.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-417.js
index 15fc5c5a5..6df596d40 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-417.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-417.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-417
 description: >
     ES5 Attributes - [[Value]] attribute of inherited property of
     [[Prototype]] internal property is correct(Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -21,9 +19,5 @@ function testcase() {
 
             var obj = foo.bind({});
 
-            return !obj.hasOwnProperty("prop") && obj.prop === 1001;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.hasOwnProperty("prop"), false, 'obj.hasOwnProperty("prop")');
+assert.sameValue(obj.prop, 1001, 'obj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-418.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-418.js
index 4e04e0352..d2c0ab532 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-418.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-418.js
@@ -7,12 +7,10 @@ description: >
     ES5 Attributes - Successfully add a property to an object when the
     object's prototype has a property with the same name and
     [[Writable]] set to true (Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -23,9 +21,5 @@ function testcase() {
             var obj = foo.bind({});
             obj.prop = 1002;
 
-            return obj.hasOwnProperty("prop") && obj.prop === 1002;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert(obj.hasOwnProperty("prop"), 'obj.hasOwnProperty("prop") !== true');
+assert.sameValue(obj.prop, 1002, 'obj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-419.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-419.js
index 5a707bcc0..e175d090f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-419.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-419.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-419
 description: >
     ES5 Attributes - Inherited property whose [[Enumerable]] attribute
     is set to true is enumerable (Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 value: 1001,
                 writable: true,
@@ -27,9 +25,5 @@ function testcase() {
                 }
             }
 
-            return !obj.hasOwnProperty("prop") && verifyEnumerable;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.hasOwnProperty("prop"), false, 'obj.hasOwnProperty("prop")');
+assert(verifyEnumerable, 'verifyEnumerable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-420.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-420.js
index 9c192fd4b..f403f9b34 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-420.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-420.js
@@ -11,7 +11,7 @@ includes: [propertyHelper.js]
 ---*/
 
 var foo = function () { };
-try {
+
     Object.defineProperty(Function.prototype, "prop", {
         value: 1001,
         writable: false,
@@ -22,7 +22,3 @@ try {
     var obj = foo.bind({});
     assert(!obj.hasOwnProperty("prop"));
     verifyNotWritable(foo, "prop", "noCheckOwnProp");
-} finally {
-    delete Function.prototype.prop;
-}
-
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-421.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-421.js
index adb3af773..120ffe0fd 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-421.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-421.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-421
 description: >
     ES5 Attributes - Inherited property whose [[Enumerable]] attribute
     is set to false is non-enumerable (Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 value: 1001,
                 writable: false,
@@ -27,9 +25,5 @@ function testcase() {
                 }
             }
 
-            return !obj.hasOwnProperty("prop") && !verifyEnumerable;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.hasOwnProperty("prop"), false, 'obj.hasOwnProperty("prop")');
+assert.sameValue(verifyEnumerable, false, 'verifyEnumerable');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-531-17.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-531-17.js
index 84835f3ca..84b8696dc 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-531-17.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-531-17.js
@@ -7,14 +7,11 @@ description: >
     ES5 Attributes - Updating an indexed accessor property 'P' using
     simple assignment is successful, 'O' is the global object (8.12.5
     step 5.b)
-includes:
-    - runTestCase.js
-    - fnGlobalObject.js
+includes: [fnGlobalObject.js]
 ---*/
 
-function testcase() {
         var obj = fnGlobalObject();
-        try {
+
             obj.verifySetFunc = "data";
             var setFunc = function (value) {
                 obj.verifySetFunc = value;
@@ -34,10 +31,6 @@ function testcase() {
             var propertyDefineCorrect = obj.hasOwnProperty("0");
             var desc = Object.getOwnPropertyDescriptor(obj, "0");
 
-            return propertyDefineCorrect && desc.set === setFunc && obj[0] === "overrideData";
-        } finally {
-            delete obj[0];
-            delete obj.verifySetFunc;
-        }
-    }
-runTestCase(testcase);
+assert(propertyDefineCorrect, 'propertyDefineCorrect !== true');
+assert.sameValue(desc.set, setFunc, 'desc.set');
+assert.sameValue(obj[0], "overrideData", 'obj[0]');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-531-8.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-531-8.js
index a39afa763..610532c9c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-531-8.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-531-8.js
@@ -13,7 +13,7 @@ includes:
 ---*/
 
 var obj = fnGlobalObject();
-try {
+
     obj.verifySetFunc = "data";
     var getFunc = function () {
         return obj.verifySetFunc;
@@ -31,7 +31,3 @@ try {
     verifyNotWritable(obj, "prop");
     assert.sameValue(typeof desc.set, "undefined");
     assert.sameValue(obj.prop, "data");
-} finally {
-    delete obj.prop;
-    delete obj.verifySetFunc;
-}
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-578.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-578.js
index f90c6ff42..eee9a7cfe 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-578.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-578.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-578
 description: >
     ES5 Attributes - [[Get]] field of inherited property of
     [[Prototype]] internal property is correct (String instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(String.prototype, "prop", {
                 get: function () {
                     return data;
@@ -24,9 +22,5 @@ function testcase() {
             });
             var strObj = new String();
 
-            return !strObj.hasOwnProperty("prop") && strObj.prop === "data";
-        } finally {
-            delete String.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(strObj.hasOwnProperty("prop"), false, 'strObj.hasOwnProperty("prop")');
+assert.sameValue(strObj.prop, "data", 'strObj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-579.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-579.js
index dab54da13..e910f3335 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-579.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-579.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-579
 description: >
     ES5 Attributes - Success to add property into object (Array
     instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(Array.prototype, "prop", {
                 get: function () {
                     return data;
@@ -25,9 +23,6 @@ function testcase() {
             var arrObj = [];
             arrObj.prop = "myOwnProperty";
 
-            return !arrObj.hasOwnProperty("prop") && arrObj.prop === "myOwnProperty" && data === "myOwnProperty";
-        } finally {
-            delete Array.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(arrObj.hasOwnProperty("prop"), false, 'arrObj.hasOwnProperty("prop")');
+assert.sameValue(arrObj.prop, "myOwnProperty", 'arrObj.prop');
+assert.sameValue(data, "myOwnProperty", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-580.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-580.js
index 8fd5bd6b1..d4c99db07 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-580.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-580.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-580
 description: >
     ES5 Attributes - Inherited property is enumerable (Boolean
     instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(Boolean.prototype, "prop", {
                 get: function () {
                     return data;
@@ -30,9 +28,5 @@ function testcase() {
                 }
             }
 
-            return !boolObj.hasOwnProperty("prop") && verifyEnumerable;
-        } finally {
-            delete Boolean.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(boolObj.hasOwnProperty("prop"), false, 'boolObj.hasOwnProperty("prop")');
+assert(verifyEnumerable, 'verifyEnumerable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-581.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-581.js
index 478e76009..2931f9c8f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-581.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-581.js
@@ -8,7 +8,7 @@ includes: [propertyHelper.js]
 ---*/
 
 var data = "data";
-try {
+
     Object.defineProperty(Number.prototype, "prop", {
         get: function () {
             return data;
@@ -23,6 +23,3 @@ try {
     assert(!numObj.hasOwnProperty("prop"));
     assert.sameValue(numObj.prop, "data");
     assert.sameValue(data, "data");
-} finally {
-    delete Number.prototype.prop;
-}
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-582.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-582.js
index ee7a5d0c9..7895b7455 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-582.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-582.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-582
 description: >
     ES5 Attributes - Inherited property is non-enumerable (Function
     instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 get: function () {
                     return data;
@@ -27,9 +25,5 @@ function testcase() {
                 }
             }
 
-            return !funObj.hasOwnProperty("prop") && !verifyEnumerable;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(funObj.hasOwnProperty("prop"), false, 'funObj.hasOwnProperty("prop")');
+assert.sameValue(verifyEnumerable, false, 'verifyEnumerable');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-583.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-583.js
index 4c765944c..97b7352fd 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-583.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-583.js
@@ -6,12 +6,10 @@ es5id: 15.2.3.6-4-583
 description: >
     ES5 Attributes - [[Get]] field of inherited property of
     [[Prototype]] internal property is correct (Error Instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(Error.prototype, "prop", {
                 get: function () {
                     return data;
@@ -24,9 +22,5 @@ function testcase() {
             });
             var errObj = new Error();
 
-            return !errObj.hasOwnProperty("prop") && errObj.prop === "data";
-        } finally {
-            delete Error.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(errObj.hasOwnProperty("prop"), false, 'errObj.hasOwnProperty("prop")');
+assert.sameValue(errObj.prop, "data", 'errObj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-584.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-584.js
index 7b8241f0f..716431a7b 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-584.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-584.js
@@ -4,12 +4,10 @@
 /*---
 es5id: 15.2.3.6-4-584
 description: ES5 Attributes - Failed to add property into object (Date instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(Date.prototype, "prop", {
                 get: function () {
                     return data;
@@ -23,9 +21,6 @@ function testcase() {
             var dateObj = new Date();
             dateObj.prop = "myOwnProperty";
 
-            return !dateObj.hasOwnProperty("prop") && dateObj.prop === "myOwnProperty" && data === "myOwnProperty";
-        } finally {
-            delete Date.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(dateObj.hasOwnProperty("prop"), false, 'dateObj.hasOwnProperty("prop")');
+assert.sameValue(dateObj.prop, "myOwnProperty", 'dateObj.prop');
+assert.sameValue(data, "myOwnProperty", 'data');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-585.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-585.js
index 4b0699022..b58e59416 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-585.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-585.js
@@ -4,12 +4,10 @@
 /*---
 es5id: 15.2.3.6-4-585
 description: ES5 Attributes - Inherited property is enumerable (RegExp instance)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(RegExp.prototype, "prop", {
                 get: function () {
                     return data;
@@ -28,9 +26,5 @@ function testcase() {
                 }
             }
 
-            return !regObj.hasOwnProperty("prop") && verifyEnumerable;
-        } finally {
-            delete RegExp.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(regObj.hasOwnProperty("prop"), false, 'regObj.hasOwnProperty("prop")');
+assert(verifyEnumerable, 'verifyEnumerable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-586.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-586.js
index f10dbde3a..37c718de9 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-586.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-586.js
@@ -10,7 +10,7 @@ includes: [propertyHelper.js]
 ---*/
 
 var data = "data";
-try {
+
     Object.defineProperty(Object.prototype, "prop", {
         get: function () {
             return data;
@@ -23,6 +23,3 @@ try {
     assert(!JSON.hasOwnProperty("prop"));
     assert.sameValue(JSON.prop, "data");
     assert.sameValue(data, "data");
-} finally {
-    delete Object.prototype.prop;
-}
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-587.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-587.js
index 911768de1..441dfe023 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-587.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-587.js
@@ -4,12 +4,10 @@
 /*---
 es5id: 15.2.3.6-4-587
 description: ES5 Attributes - Inherited property is non-enumerable (Math)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var data = "data";
-        try {
+
             Object.defineProperty(Object.prototype, "prop", {
                 get: function () {
                     return data;
@@ -24,9 +22,5 @@ function testcase() {
                 }
             }
 
-            return !Math.hasOwnProperty("prop") && !verifyEnumerable;
-        } finally {
-            delete Object.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(Math.hasOwnProperty("prop"), false, 'Math.hasOwnProperty("prop")');
+assert.sameValue(verifyEnumerable, false, 'verifyEnumerable');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-593.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-593.js
index 558c90b47..877f17efb 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-593.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-593.js
@@ -7,13 +7,11 @@ description: >
     ES5 Attributes - [[Get]] field of inherited property of
     [[Prototype]] internal property is correct
     (Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
         var data = "data";
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 get: function () {
                     return data;
@@ -27,9 +25,5 @@ function testcase() {
 
             var obj = foo.bind({});
 
-            return !obj.hasOwnProperty("prop") && obj.prop === data;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.hasOwnProperty("prop"), false, 'obj.hasOwnProperty("prop")');
+assert.sameValue(obj.prop, data, 'obj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-594.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-594.js
index 6fe125ff1..8d5726679 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-594.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-594.js
@@ -6,13 +6,11 @@ es5id: 15.2.3.6-4-594
 description: >
     ES5 Attributes - Success to update value of property into of
     [[Proptotype]] internal property (Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
         var data = "data";
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 get: function () {
                     return data;
@@ -27,9 +25,5 @@ function testcase() {
             var obj = foo.bind({});
             obj.prop = "overrideData";
 
-            return !obj.hasOwnProperty("prop") && obj.prop === "overrideData";
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.hasOwnProperty("prop"), false, 'obj.hasOwnProperty("prop")');
+assert.sameValue(obj.prop, "overrideData", 'obj.prop');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-595.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-595.js
index 30be14f7a..2f800ac1c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-595.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-595.js
@@ -6,13 +6,11 @@ es5id: 15.2.3.6-4-595
 description: >
     ES5 Attributes - Inherited property is enumerable
     (Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
         var data = "data";
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 get: function () {
                     return data;
@@ -33,9 +31,5 @@ function testcase() {
                 }
             }
 
-            return !obj.hasOwnProperty("prop") && verifyEnumerable;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.hasOwnProperty("prop"), false, 'obj.hasOwnProperty("prop")');
+assert(verifyEnumerable, 'verifyEnumerable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-596.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-596.js
index 8c99225e0..5489deaa0 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-596.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-596.js
@@ -11,7 +11,7 @@ includes: [propertyHelper.js]
 
 var foo = function () { };
 var data = "data";
-try {
+
     Object.defineProperty(Function.prototype, "prop", {
         get: function () {
             return data;
@@ -25,6 +25,3 @@ try {
     assert(!obj.hasOwnProperty("prop"));
     verifyNotWritable(obj, "prop", "nocheck");
     assert.sameValue(obj.prop, "data");;
-} finally {
-    delete Function.prototype.prop;
-}
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-597.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-597.js
index 81c4daa17..9a46c54cd 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-597.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-597.js
@@ -6,13 +6,11 @@ es5id: 15.2.3.6-4-597
 description: >
     ES5 Attributes - Inherited property is non-enumerable
     (Function.prototype.bind)
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var foo = function () { };
         var data = "data";
-        try {
+
             Object.defineProperty(Function.prototype, "prop", {
                 get: function () {
                     return data;
@@ -30,9 +28,5 @@ function testcase() {
                 }
             }
 
-            return !obj.hasOwnProperty("prop") && !verifyEnumerable;
-        } finally {
-            delete Function.prototype.prop;
-        }
-    }
-runTestCase(testcase);
+assert.sameValue(obj.hasOwnProperty("prop"), false, 'obj.hasOwnProperty("prop")');
+assert.sameValue(verifyEnumerable, false, 'verifyEnumerable');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-598.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-598.js
index 640eb9e6e..55420c69f 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-598.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-598.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-598
 description: >
     ES5 Attributes - all attributes in Object.getPrototypeOf are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "getPrototypeOf");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.getPrototypeOf;
 
-        try {
             Object.getPrototypeOf = "2010";
 
             var isWritable = (Object.getPrototypeOf === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("getPrototypeOf");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "getPrototypeOf", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-599.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-599.js
index 03b2f21f7..00e61a739 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-599.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-599.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-599
 description: >
     ES5 Attributes - all attributes in Object.getOwnPropertyDescriptor
     are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "getOwnPropertyDescriptor");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.getOwnPropertyDescriptor;
 
-        try {
             Object.getOwnPropertyDescriptor = "2010";
 
             var isWritable = (Object.getOwnPropertyDescriptor === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("getOwnPropertyDescriptor");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "getOwnPropertyDescriptor", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-600.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-600.js
index ad0ab1994..7f1ab0b27 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-600.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-600.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-600
 description: >
     ES5 Attributes - all attributes in Object.getOwnPropertyNames are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "getOwnPropertyNames");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.getOwnPropertyNames;
 
-        try {
             Object.getOwnPropertyNames = "2010";
 
             var isWritable = (Object.getOwnPropertyNames === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("getOwnPropertyNames");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "getOwnPropertyNames", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-601.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-601.js
index 52108e4df..b9bcd8dc3 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-601.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-601.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-601
 description: ES5 Attributes - all attributes in Object.create are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "create");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.create;
 
-        try {
             Object.create = "2010";
 
             var isWritable = (Object.create === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("create");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "create", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-602.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-602.js
index 6fd4a3d95..d2f6f0de2 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-602.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-602.js
@@ -6,15 +6,13 @@ es5id: 15.2.3.6-4-602
 description: >
     ES5 Attributes - all attributes in Object.defineProperty are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "defineProperty");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
         var temp = Object.defineProperty;
-        try {
+
             Object.defineProperty = "2010";
 
             var isWritable = (Object.defineProperty === "2010");
@@ -31,12 +29,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("defineProperty");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty = temp;
-            Object.defineProperty(Object, "defineProperty", {
-                enumerable: false
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-603.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-603.js
index 542f3b58e..7959a39ee 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-603.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-603.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-603
 description: >
     ES5 Attributes - all attributes in Object.defineProperties are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "defineProperties");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.defineProperties;
 
-        try {
             Object.defineProperties = "2010";
 
             var isWritable = (Object.defineProperties === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("defineProperties");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "defineProperties", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-604.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-604.js
index c008b7363..497ebad75 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-604.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-604.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-604
 description: ES5 Attributes - all attributes in Object.seal are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "seal");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.seal;
 
-        try {
             Object.seal = "2010";
 
             var isWritable = (Object.seal === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("seal");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "seal", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-605.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-605.js
index a9a897e8f..45952f26c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-605.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-605.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-605
 description: ES5 Attributes - all attributes in Object.freeze are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "freeze");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.freeze;
 
-        try {
             Object.freeze = "2010";
 
             var isWritable = (Object.freeze === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("freeze");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "freeze", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-606.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-606.js
index 471a8a7db..a3621fdd1 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-606.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-606.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-606
 description: >
     ES5 Attributes - all attributes in Object.preventExtensions are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "preventExtensions");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.preventExtensions;
 
-        try {
             Object.preventExtensions = "2010";
 
             var isWritable = (Object.preventExtensions === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("preventExtensions");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "preventExtensions", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-607.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-607.js
index 580052300..88beb3e67 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-607.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-607.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-607
 description: ES5 Attributes - all attributes in Object.isSealed are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "isSealed");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.isSealed;
 
-        try {
             Object.isSealed = "2010";
 
             var isWritable = (Object.isSealed === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("isSealed");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "isSealed", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-608.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-608.js
index cde4a901b..f752bc678 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-608.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-608.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-608
 description: ES5 Attributes - all attributes in Object.isFrozen are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "isFrozen");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.isFrozen;
 
-        try {
             Object.isFrozen = "2010";
 
             var isWritable = (Object.isFrozen === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("isFrozen");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "isFrozen", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-609.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-609.js
index 43ad1010e..aa12befa7 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-609.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-609.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-609
 description: ES5 Attributes - all attributes in Object.isExtensible are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "isExtensible");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.isExtensible;
 
-        try {
             Object.isExtensible = "2010";
 
             var isWritable = (Object.isExtensible === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("isExtensible");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "isExtensible", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-610.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-610.js
index e8b2403df..07cc6c4d8 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-610.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-610.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-610
 description: ES5 Attributes - all attributes in Object.keys are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Object, "keys");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Object.keys;
 
-        try {
             Object.keys = "2010";
 
             var isWritable = (Object.keys === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Object.hasOwnProperty("keys");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Object, "keys", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-611.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-611.js
index 949e52fad..aa0a5b9ce 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-611.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-611.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-611
 description: >
     ES5 Attributes - all attributes in Function.prototype.bind are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Function.prototype, "bind");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Function.prototype.bind;
 
-        try {
             Function.prototype.bind = "2010";
 
             var isWritable = (Function.prototype.bind === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Function.prototype.hasOwnProperty("bind");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Function.prototype, "bind", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-612.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-612.js
index 3378d1497..74ff9cba3 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-612.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-612.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-612
 description: >
     ES5 Attributes - all attributes in Array.prototype.indexOf are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "indexOf");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.indexOf;
 
-        try {
             Array.prototype.indexOf = "2010";
 
             var isWritable = (Array.prototype.indexOf === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("indexOf");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "indexOf", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-613.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-613.js
index 8d179d0b2..58bf1afa6 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-613.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-613.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-613
 description: ES5 Attributes - all attributes in Object.lastIndexOf are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "lastIndexOf");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.lastIndexOf;
 
-        try {
             Array.prototype.lastIndexOf = "2010";
 
             var isWritable = (Array.prototype.lastIndexOf === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("lastIndexOf");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "lastIndexOf", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-614.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-614.js
index f4ee4f588..cd393df4c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-614.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-614.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-614
 description: >
     ES5 Attributes - all attributes in Array.prototype.every are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "every");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.every;
 
-        try {
             Array.prototype.every = "2010";
 
             var isWritable = (Array.prototype.every === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("every");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "every", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-615.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-615.js
index c93ce2921..172758c2c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-615.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-615.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-615
 description: ES5 Attributes - all attributes in Array.prototype.some are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "some");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.some;
 
-        try {
             Array.prototype.some = "2010";
 
             var isWritable = (Array.prototype.some === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("some");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "some", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-616.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-616.js
index e922be1de..4a53ab993 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-616.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-616.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-616
 description: >
     ES5 Attributes - all attributes in Array.prototype.forEach are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "forEach");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.forEach;
 
-        try {
             Array.prototype.forEach = "2010";
 
             var isWritable = (Array.prototype.forEach === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("forEach");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "forEach", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-617.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-617.js
index e361a7aee..7e41f46c4 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-617.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-617.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-617
 description: ES5 Attributes - all attributes in Array.prototype.map are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "map");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.map;
 
-        try {
             Array.prototype.map = "2010";
 
             var isWritable = (Array.prototype.map === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("map");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "map", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-618.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-618.js
index 6685458f0..27492e2e3 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-618.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-618.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-618
 description: >
     ES5 Attributes - all attributes in Array.prototype.filter are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "filter");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.filter;
 
-        try {
             Array.prototype.filter = "2010";
 
             var isWritable = (Array.prototype.filter === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("filter");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "filter", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-619.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-619.js
index d0788918c..408f1417d 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-619.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-619.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-619
 description: >
     ES5 Attributes - all attributes in Array.prototype.reduce are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "reduce");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.reduce;
 
-        try {
             Array.prototype.reduce = "2010";
 
             var isWritable = (Array.prototype.reduce === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("reduce");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "reduce", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-620.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-620.js
index 8afc75751..e2a9f56f5 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-620.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-620.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-620
 description: >
     ES5 Attributes - all attributes in Array.prototype.reduceRight are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Array.prototype, "reduceRight");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Array.prototype.reduceRight;
 
-        try {
             Array.prototype.reduceRight = "2010";
 
             var isWritable = (Array.prototype.reduceRight === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Array.prototype.hasOwnProperty("reduceRight");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Array.prototype, "reduceRight", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-621.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-621.js
index 273168780..b7e2ebf5c 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-621.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-621.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-621
 description: >
     ES5 Attributes - all attributes in String.prototype.trim are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(String.prototype, "trim");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = String.prototype.trim;
 
-        try {
             String.prototype.trim = "2010";
 
             var isWritable = (String.prototype.trim === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !String.prototype.hasOwnProperty("trim");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(String.prototype, "trim", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-622.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-622.js
index 6ca6f94ce..c587d33d4 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-622.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-622.js
@@ -4,17 +4,14 @@
 /*---
 es5id: 15.2.3.6-4-622
 description: ES5 Attributes - all attributes in Date.now are correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Date, "now");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Date.now;
 
-        try {
             Date.now = "2010";
 
             var isWritable = (Date.now === "2010");
@@ -31,14 +28,7 @@ function testcase() {
 
             var isConfigurable = !Date.hasOwnProperty("now");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Date, "now", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-623.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-623.js
index d1374fdae..f96eb0c02 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-623.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-623.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-623
 description: >
     ES5 Attributes - all attributes in Date.prototype.toISOString are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Date.prototype, "toISOString");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Date.prototype.toISOString;
 
-        try {
             Date.prototype.toISOString = "2010";
 
             var isWritable = (Date.prototype.toISOString === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Date.prototype.hasOwnProperty("toISOString");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Date.prototype, "toISOString", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/defineProperty/15.2.3.6-4-624.js b/test/built-ins/Object/defineProperty/15.2.3.6-4-624.js
index c8515ada1..5b6abba13 100644
--- a/test/built-ins/Object/defineProperty/15.2.3.6-4-624.js
+++ b/test/built-ins/Object/defineProperty/15.2.3.6-4-624.js
@@ -6,17 +6,14 @@ es5id: 15.2.3.6-4-624
 description: >
     ES5 Attributes - all attributes in Date.prototype.toJSON are
     correct
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var desc = Object.getOwnPropertyDescriptor(Date.prototype, "toJSON");
 
         var propertyAreCorrect = (desc.writable === true && desc.enumerable === false && desc.configurable === true);
 
         var temp = Date.prototype.toJSON;
 
-        try {
             Date.prototype.toJSON = "2010";
 
             var isWritable = (Date.prototype.toJSON === "2010");
@@ -33,14 +30,7 @@ function testcase() {
 
             var isConfigurable = !Date.prototype.hasOwnProperty("toJSON");
 
-            return propertyAreCorrect && isWritable && !isEnumerable && isConfigurable;
-        } finally {
-            Object.defineProperty(Date.prototype, "toJSON", {
-                value: temp,
-                writable: true,
-                enumerable: false,
-                configurable: true
-            });
-        }
-    }
-runTestCase(testcase);
+assert(propertyAreCorrect, 'propertyAreCorrect !== true');
+assert(isWritable, 'isWritable !== true');
+assert.sameValue(isEnumerable, false, 'isEnumerable');
+assert(isConfigurable, 'isConfigurable !== true');
diff --git a/test/built-ins/Object/getOwnPropertyNames/15.2.3.4-2-4.js b/test/built-ins/Object/getOwnPropertyNames/15.2.3.4-2-4.js
index 8401f8ad7..fd42435c7 100644
--- a/test/built-ins/Object/getOwnPropertyNames/15.2.3.4-2-4.js
+++ b/test/built-ins/Object/getOwnPropertyNames/15.2.3.4-2-4.js
@@ -6,23 +6,15 @@ es5id: 15.2.3.4-2-4
 description: >
     Object.getOwnPropertyNames - returned array is the standard
     built-in constructor
-includes: [runTestCase.js]
 ---*/
 
-function testcase() {
         var oldArray = Array;
         Array = function () {
             throw new Error("invoke customer defined Array!");
         };
 
         var obj = {};
-        try {
+
             var result = Object.getOwnPropertyNames(obj);
-            return Object.prototype.toString.call(result) === "[object Array]";
-        } catch (ex) {
-            return false;
-        } finally {
-            Array = oldArray;
-        }
-    }
-runTestCase(testcase);
+
+assert.sameValue(Object.prototype.toString.call(result), "[object Array]", 'Object.prototype.toString.call(result)');