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diff --git a/js/src/tests/test262/built-ins/Math/cosh/length.js b/js/src/tests/test262/built-ins/Math/cosh/length.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Math/cosh/length.js
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+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+es6id: 20.2.2.13
+description: Length property of Math.cosh is 1
+info: |
+  Math.cosh ( x )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value
+    is a String.
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(Math.cosh.length, 1);
+
+verifyNotEnumerable(Math.cosh, "length");
+verifyNotWritable(Math.cosh, "length");
+verifyConfigurable(Math.cosh, "length");
+
+reportCompare(0, 0);