diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-forEach.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-forEach.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,59 @@
+/* test Map.prototype.forEach */
+
+load(libdir + 'asserts.js');
+load(libdir + 'iteration.js');
+
+// testing success conditions of Map.prototype.forEach
+
+var testMap = new Map();
+
+function callback(value, key, map) {
+    testMap.set(key, value);
+    assertEq(map.has(key), true);
+    assertEq(map.get(key), value);
+}
+
+var initialMap = new Map([['a', 1], ['b', 2.3], [false, undefined]]);
+initialMap.forEach(callback);
+
+// test that both the Maps are equal and are in same order
+var iterator = initialMap[std_iterator]();
+var count = 0;
+for (var [k, v] of testMap) {
+    assertEq(initialMap.has(k), true);
+    assertEq(initialMap.get(k), testMap.get(k));
+    assertIteratorNext(iterator, [k, testMap.get(k)]);
+    count++;
+}
+
+//check both the Maps we have are equal in size
+assertEq(initialMap.size, testMap.size);
+assertEq(initialMap.size, count);
+
+var x = { abc: 'test'};
+function callback2(value, key, map) {
+    assertEq(x, this);
+}
+initialMap = new Map([['a', 1]]);
+initialMap.forEach(callback2, x);
+
+// testing failure conditions of Map.prototype.forEach
+
+var s = new Set([1, 2, 3]);
+assertThrowsInstanceOf(function() {
+    Map.prototype.forEach.call(s, callback);
+}, TypeError, "Map.prototype.forEach should raise TypeError if not used on a Map");
+
+var fn = 2;
+assertThrowsInstanceOf(function() {
+    initialMap.forEach(fn);
+}, TypeError, "Map.prototype.forEach should raise TypeError if callback is not a function");
+
+// testing that Map#forEach uses internal next() function and does not stop when
+// StopIteration exception is thrown
+
+var m = new Map([["one", 1]]);
+Object.getPrototypeOf(m[std_iterator]()).next = function () { throw "FAIL"; };
+assertThrowsInstanceOf(function () {
+  m.forEach(function () { throw StopIteration; });
+}, StopIteration, "Map.prototype.forEach should use intrinsic next method.");