diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-ctor-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-ctor-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+load(libdir + 'asserts.js');
+
+// Debugger rejects arguments that aren't cross-compartment wrappers.
+assertThrowsInstanceOf(function () { Debugger(null); }, TypeError);
+assertThrowsInstanceOf(function () { Debugger(true); }, TypeError);
+assertThrowsInstanceOf(function () { Debugger(42); }, TypeError);
+assertThrowsInstanceOf(function () { Debugger("bad"); }, TypeError);
+assertThrowsInstanceOf(function () { Debugger(function () {}); }, TypeError);
+assertThrowsInstanceOf(function () { Debugger(this); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(null); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(true); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(42); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger("bad"); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(function () {}); }, TypeError);
+assertThrowsInstanceOf(function () { new Debugger(this); }, TypeError);
+
+// From the main compartment, creating a Debugger on a sandbox compartment.
+var g = newGlobal();
+var dbg = new Debugger(g);
+assertEq(dbg instanceof Debugger, true);
+assertEq(Object.getPrototypeOf(dbg), Debugger.prototype);