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diff --git a/test/built-ins/AsyncGeneratorPrototype/return/this-val-not-async-generator.js b/test/built-ins/AsyncGeneratorPrototype/return/this-val-not-async-generator.js
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+++ b/test/built-ins/AsyncGeneratorPrototype/return/this-val-not-async-generator.js
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+// Copyright 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asyncgenerator-prototype-return
+description: return rejects promise when `this` value is not an async generator
+info: |
+  AsyncGenerator.prototype.return ( exception )
+  1. Let generator be the this value.
+  2. Let completion be Completion{[[Type]]: return, [[Value]]: value,
+     [[Target]]: empty}.
+  3. Return ! AsyncGeneratorEnqueue(generator, completion).
+
+  AsyncGeneratorEnqueue ( generator, completion )
+  ...
+  3. If Type(generator) is not Object, or if generator does not have an
+     [[AsyncGeneratorState]] internal slot, then
+    a. Let badGeneratorError be a newly created TypeError object.
+    b. Perform ! Call(promiseCapability.[[Reject]], undefined, « badGeneratorError »).
+    c. Return promiseCapability.[[Promise]].
+
+flags: [async]
+features: [async-iteration]
+---*/
+
+async function* g() {}
+var AsyncGeneratorPrototype = Object.getPrototypeOf(g).prototype;
+
+function* syncGenerator() {}
+var syncIterator = syncGenerator()
+
+var testPromises = [
+  AsyncGeneratorPrototype.return.call({}).then(
+    function () {
+      throw new Test262Error("AsyncGeneratorPrototype.throw should reject promise" +
+                             " when `this` value is an object");
+    },
+    function (e) {
+      if (!(e instanceof TypeError)) {
+       throw new Test262Error("(object) expected TypeError but got " + e);
+      }
+    }
+  ),
+  AsyncGeneratorPrototype.return.call(function() {}).then(
+    function () {
+      throw new Test262Error("AsyncGeneratorPrototype.throw should reject promise" +
+                             " when `this` value is a function");
+    },
+    function (e) {
+      if (!(e instanceof TypeError)) {
+       throw new Test262Error("(function) expected TypeError but got " + e);
+      }
+    }
+  ),
+  AsyncGeneratorPrototype.return.call(g).then(
+    function () {
+      throw new Test262Error("AsyncGeneratorPrototype.throw should reject promise" +
+                             " when `this` value is an async generator function");
+    },
+    function (e) {
+      if (!(e instanceof TypeError)) {
+       throw new Test262Error("(async generator function) expected TypeError but got " + e);
+      }
+    }
+  ),
+  AsyncGeneratorPrototype.return.call(g.prototype).then(
+    function () {
+      throw new Test262Error("AsyncGeneratorPrototype.throw should reject promise" +
+                             " when `this` value is an async generator function prototype object");
+    },
+    function (e) {
+      if (!(e instanceof TypeError)) {
+       throw new Test262Error("(async generator function prototype) expected TypeError but got " + e);
+      }
+    },
+  ),
+  AsyncGeneratorPrototype.return.call(syncIterator).then(
+    function () {
+      throw new Test262Error("AsyncGeneratorPrototype.throw should reject promise" +
+                             " when `this` value is a generator");
+    },
+    function (e) {
+      if (!(e instanceof TypeError)) {
+       throw new Test262Error("(generator) expected TypeError but got " + e);
+      }
+    }
+  )
+]
+
+Promise.all(testPromises).then(() => {}).then($DONE, $DONE)