diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-environment-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-environment-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// dbg.getNewestFrame().environment works.
+
+var g = newGlobal();
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+g.h = function () {
+    var env = dbg.getNewestFrame().environment;
+    assertEq(env instanceof Debugger.Environment, true);
+    assertEq(env.object, gw);
+    assertEq(env.parent, null);
+};
+g.eval("h()");