diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/array-iterator-keys-entries.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/array-iterator-keys-entries.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+// array.keys() returns an iterator over the index of elements
+// and array.entries() returns an iterator that yields pairs [index, element].
+
+load(libdir + "iteration.js");
+
+var data = [1, 2, 3, "abc"];
+
+var ki = data.keys();
+for (var i = 0; i < data.length; i++)
+  assertIteratorResult(ki.next(), i, false);
+assertIteratorDone(ki, undefined);
+
+var ei = data.entries();
+for (var i = 0; i < data.length; i++)
+  assertIteratorResult(ei.next(), [i, data[i]], false);
+assertIteratorDone(ei, undefined);