diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/makeGlobalObjectReference-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/makeGlobalObjectReference-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// Debugger.prototype.makeGlobalObjectReference only accepts actual global objects.
+
+load(libdir + 'asserts.js');
+
+var dbg = new Debugger;
+
+assertThrowsInstanceOf(() => dbg.makeGlobalObjectReference(true), TypeError);
+assertThrowsInstanceOf(() => dbg.makeGlobalObjectReference("foo"), TypeError);
+assertThrowsInstanceOf(() => dbg.makeGlobalObjectReference(12), TypeError);
+assertThrowsInstanceOf(() => dbg.makeGlobalObjectReference(undefined), TypeError);
+assertThrowsInstanceOf(() => dbg.makeGlobalObjectReference(null), TypeError);
+assertThrowsInstanceOf(() => dbg.makeGlobalObjectReference({ xlerb: "sbot" }), TypeError);
+assertEq(dbg.makeGlobalObjectReference(this) instanceof Debugger.Object, true);