1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testTestIntegrityLevel.js b/js/src/jit-test/tests/proxy/testTestIntegrityLevel.js
new file mode 100644
index 000000000..4defb5f60
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testTestIntegrityLevel.js
@@ -0,0 +1,30 @@
+// isSealed/isFrozen should short-circuit.
+
+var count = 0;
+var target = Object.preventExtensions({a: 1, b: 2, c: 3});
+var p = new Proxy(target, {
+    getOwnPropertyDescriptor(t, id) {
+        count++;
+        return Object.getOwnPropertyDescriptor(t, id);
+    }
+});
+assertEq(Object.isSealed(p), false);
+assertEq(count, 1);
+
+count = 0;
+assertEq(Object.isFrozen(p), false);
+assertEq(count, 1);
+
+Object.seal(target);
+count = 0;
+assertEq(Object.isSealed(p), true);
+assertEq(count, 3);
+
+count = 0;
+assertEq(Object.isFrozen(p), false);
+assertEq(count, 1);
+
+Object.freeze(target);
+count = 0;
+assertEq(Object.isFrozen(p), true);
+assertEq(count, 3);