diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/unit/test_nativewrappers.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/unit/test_nativewrappers.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+function run_test()
+{
+  Components.utils.import("resource://gre/modules/jsdebugger.jsm");
+  addDebuggerToGlobal(this);
+  var g = testGlobal("test1");
+
+  var dbg = new Debugger();
+  dbg.addDebuggee(g);
+  dbg.onDebuggerStatement = function(aFrame) {
+    let args = aFrame.arguments;
+    try {
+      args[0];
+      do_check_true(true);
+    } catch(ex) {
+      do_check_true(false);
+    }
+  };
+
+  g.eval("function stopMe(arg) {debugger;}");
+
+  g2 = testGlobal("test2");
+  g2.g = g;
+  g2.eval("(" + function createBadEvent() {
+    let parser = Components.classes["@mozilla.org/xmlextras/domparser;1"].createInstance(Components.interfaces.nsIDOMParser);
+    let doc = parser.parseFromString("<foo></foo>", "text/xml");
+    g.stopMe(doc.createEvent("MouseEvent"));
+  } + ")()");
+
+  dbg.enabled = false;
+}