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diff --git a/js/src/jit-test/tests/debug/Object-unsafeDereference-01.js b/js/src/jit-test/tests/debug/Object-unsafeDereference-01.js
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index 000000000..7e560b665
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+++ b/js/src/jit-test/tests/debug/Object-unsafeDereference-01.js
@@ -0,0 +1,10 @@
+// Debugger.Object.prototype.unsafeDereference returns the referent directly.
+
+var g = newGlobal();
+var dbg = new Debugger();
+var gw = dbg.addDebuggee(g);
+
+assertEq(gw.getOwnPropertyDescriptor('Math').value.unsafeDereference(), g.Math);
+
+g.eval('var obj = {}');
+assertEq(gw.getOwnPropertyDescriptor('obj').value.unsafeDereference(), g.obj);