diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-ctor-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-ctor-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+// |jit-test| debug
+// Test creating a Debugger in a sandbox, debugging the initial global.
+//
+// This requires debug mode to already be on in the initial global, since it's
+// always on the stack in the shell. Hence the |jit-test| tag.
+
+load(libdir + 'asserts.js');
+
+var g = newGlobal();
+g.debuggeeGlobal = this;
+g.eval("var dbg = new Debugger(debuggeeGlobal);");
+assertEq(g.eval("dbg instanceof Debugger"), true);
+
+// The Debugger constructor from this compartment will not accept as its argument
+// an Object from this compartment. Shenanigans won't fool the membrane.
+g.parent = this;
+assertThrowsInstanceOf(function () { g.eval("parent.Debugger(parent.Object())"); }, TypeError);