1 files changed, 12 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxyKeys5.js b/js/src/jit-test/tests/proxy/testDirectProxyKeys5.js
new file mode 100644
index 000000000..2ccfc5cd3
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyKeys5.js
@@ -0,0 +1,12 @@
+load(libdir + "asserts.js");
+
+/*
+ * Throw a TypeError if the trap reports a new own property on a non-extensible
+ * object
+ */
+var target = {};
+Object.preventExtensions(target);
+
+var handler = { ownKeys: () => [ 'foo' ] };
+for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])
+    assertThrowsInstanceOf(() => Object.keys(p), TypeError);