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diff --git a/js/src/jit-test/tests/debug/Debugger-findObjects-05.js b/js/src/jit-test/tests/debug/Debugger-findObjects-05.js
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+++ b/js/src/jit-test/tests/debug/Debugger-findObjects-05.js
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+// findObjects' result doesn't include any duplicates.
+
+var g = newGlobal();
+var dbg = new Debugger();
+dbg.addDebuggee(g);
+
+let objects = dbg.findObjects();
+let set = new Set(objects);
+
+assertEq(objects.length, set.size);