1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/non262/Symbol/symbol-object-not-unboxed-for-value-to-id.js b/js/src/tests/non262/Symbol/symbol-object-not-unboxed-for-value-to-id.js
new file mode 100644
index 0000000000..d889a77162
--- /dev/null
+++ b/js/src/tests/non262/Symbol/symbol-object-not-unboxed-for-value-to-id.js
@@ -0,0 +1,31 @@
+// Create a symbol and a wrapper for it.
+var s = Symbol();
+var so = Object(s);
+
+// Create a symbol-valued property key using |s|.
+var o = {[s]: 0};
+
+// The default Symbol.prototype[@@toPrimitive] will unbox the symbol object as needed.
+assertEq(o.propertyIsEnumerable(so), true);
+assertEq(o.hasOwnProperty(so), true);
+
+// After redefining Symbol.prototype[@@toPrimitive], any calls to the ToPropertyKey
+// abstract operation will no longer unbox the symbol object.
+Object.defineProperty(Symbol.prototype, Symbol.toPrimitive, {
+    value: function() {
+        return "foo";
+    }
+});
+
+// |o| doesn't have a string-valued property named "foo".
+assertEq(o.propertyIsEnumerable(so), false);
+assertEq(o.hasOwnProperty(so), false);
+
+o.foo = 123;
+
+// After |o.foo| was added, both calls should return true again.
+assertEq(o.propertyIsEnumerable(so), true);
+assertEq(o.hasOwnProperty(so), true);
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);