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diff --git a/js/src/tests/test262/ch13/13.1/13.1-31-s.js b/js/src/tests/test262/ch13/13.1/13.1-31-s.js
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+++ b/js/src/tests/test262/ch13/13.1/13.1-31-s.js
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+/// Copyright (c) 2012 Ecma International.  All rights reserved. 
+/// Ecma International makes this code available under the terms and conditions set
+/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
+/// "Use Terms").   Any redistribution of this code must retain the above 
+/// copyright and this notice and otherwise comply with the Use Terms.
+/**
+ * Refer 13.1; 
+ * It is a SyntaxError if any Identifier value occurs more than once within a FormalParameterList of a strict mode
+ * FunctionDeclaration or FunctionExpression.
+ *
+ * @path ch13/13.1/13.1-31-s.js
+ * @description Strict Mode - SyntaxError is thrown if a function is created using a FunctionExpression that is contained in eval strict code and the function has two identical parameters, which are separated by a unique parameter name
+ * @onlyStrict
+ */
+
+
+function testcase() {
+
+        try {
+            eval("'use strict'; var _13_1_31_fun = function (param1, param2, param1) { };");
+            return false;
+        } catch (e) {
+            return e instanceof SyntaxError;
+        }
+    }
+runTestCase(testcase);