diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-debuggees-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-debuggees-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// The array returned by getDebuggees is just a snapshot, not live.
+var dbg = new Debugger;
+var a1 = dbg.getDebuggees();
+var g = newGlobal();
+var gw = dbg.addDebuggee(g);
+assertEq(gw instanceof Debugger.Object, true);
+var a2 = dbg.getDebuggees();
+assertEq(a2.length, 1);
+assertEq(a2[0], gw);
+assertEq(a1.length, 0);