1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-5.js b/js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-5.js
new file mode 100644
index 0000000000..efb6db149f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-5.js
@@ -0,0 +1,35 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.reduce
+description: >
+    Array.prototype.reduce - k values are accessed during each
+    iteration and not prior to starting the loop on an Array
+---*/
+
+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);
+
+assert(result, 'result !== true');
+assert.sameValue(called, 4, 'called');
+
+reportCompare(0, 0);