1 files changed, 11 insertions, 0 deletions
diff --git a/js/src/tests/non262/object/setPrototypeOf-cross-realm-cycle.js b/js/src/tests/non262/object/setPrototypeOf-cross-realm-cycle.js
new file mode 100644
index 0000000000..e2efe010eb
--- /dev/null
+++ b/js/src/tests/non262/object/setPrototypeOf-cross-realm-cycle.js
@@ -0,0 +1,11 @@
+// The cycle check in 9.1.2 [[SetPrototypeOf]] prevents cross-realm cycles
+// involving only ordinary objects.
+
+var gw = newGlobal();
+
+var obj = {};
+var w = gw.Object.create(obj);
+assertThrowsInstanceOf(() => Object.setPrototypeOf(obj, w), TypeError);
+assertThrowsInstanceOf(() => gw.Object.setPrototypeOf(obj, w), gw.TypeError);
+
+reportCompare(0, 0);