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diff --git a/test/built-ins/Math/cos/length.js b/test/built-ins/Math/cos/length.js
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+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 20.2.2.12
+description: >
+  Math.cos.length is 1.
+info: >
+  Math.cos ( x )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description, including optional
+    parameters. However, rest parameters shown using the form “...name”
+    are not included in the default argument count.
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(Math.cos.length, 1);
+
+verifyNotEnumerable(Math.cos, "length");
+verifyNotWritable(Math.cos, "length");
+verifyConfigurable(Math.cos, "length");