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diff --git a/external/contributions/Microsoft/ietcLatest/TestCases/ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-9-c-ii-5.js b/external/contributions/Microsoft/ietcLatest/TestCases/ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-9-c-ii-5.js
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+++ b/external/contributions/Microsoft/ietcLatest/TestCases/ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-9-c-ii-5.js
@@ -0,0 +1,52 @@
+/// Copyright (c) 2009 Microsoft Corporation 
+/// 
+/// Redistribution and use in source and binary forms, with or without modification, are permitted provided
+/// that the following conditions are met: 
+///    * Redistributions of source code must retain the above copyright notice, this list of conditions and
+///      the following disclaimer. 
+///    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and 
+///      the following disclaimer in the documentation and/or other materials provided with the distribution.  
+///    * Neither the name of Microsoft nor the names of its contributors may be used to
+///      endorse or promote products derived from this software without specific prior written permission.
+/// 
+/// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+/// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+/// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+/// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+/// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+/// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+/// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+/// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/**
+ * @path ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-9-c-ii-5.js
+ * @description Array.prototype.reduce - k values are accessed during each iteration and not prior to starting the loop on an Array
+ */
+
+
+function testcase() {
+
+        var result = true;
+        var kIndex = [];
+        var called = 0;
+
+        //By below way, we could verify that k would be setted as 0, 1, ..., length - 1 in order, and each value will be setted one time.
+        function callbackfn(prevVal, curVal, idx, obj) {
+            //Each position should be visited one time, which means k is accessed one time during iterations.
+            called++;
+            if (typeof kIndex[idx] === "undefined") {
+                //when current position is visited, its previous index should has been visited.
+                if (idx !== 0 && typeof kIndex[idx - 1] === "undefined") {
+                    result = false;
+                }
+                kIndex[idx] = 1;
+            } else {
+                result = false;
+            }
+        }
+
+        [11, 12, 13, 14].reduce(callbackfn, 1);
+
+        return result && called === 4;
+    }
+runTestCase(testcase);