diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-deleteProperty-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-deleteProperty-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+// Basic deleteProperty tests.
+
+var g = newGlobal();
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+
+assertEq(gw.deleteProperty("no such property"), true);
+
+g.Object.defineProperty(g, "p", {configurable: true, value: 0});
+assertEq(gw.deleteProperty("p"), true);
+
+g[0] = 0;
+assertEq(gw.deleteProperty(0), true);
+assertEq("0" in g, false);
+
+assertEq(gw.deleteProperty(), false);  // can't delete g.undefined
+assertEq(g.undefined, undefined);