diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-iterator-order.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-iterator-order.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// Map iterators produces entries in the order they were inserted.
+
+load(libdir + "eqArrayHelper.js");
+
+var map = Map();
+for (var i = 7; i !== 1; i = i * 7 % 1117)
+    map.set("" + i, i);
+assertEq(map.size, 557);
+
+i = 7;
+for (var pair of map) {
+    assertEqArray(pair, ["" + i, i]);
+    i = i * 7 % 1117;
+}
+assertEq(i, 1);