1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/ownKeys/not-extensible-new-keys-throws.js b/js/src/tests/test262/built-ins/Proxy/ownKeys/not-extensible-new-keys-throws.js
new file mode 100644
index 0000000000..dda61a8aab
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/ownKeys/not-extensible-new-keys-throws.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys
+description: >
+    If target is not extensible, the result can't contain keys names not
+    contained in the target object.
+info: |
+    [[OwnPropertyKeys]] ( )
+
+    ...
+    20. If uncheckedResultKeys is not empty, throw a TypeError exception.
+features: [Proxy]
+---*/
+
+var target = {
+  foo: 1
+};
+
+var p = new Proxy(target, {
+  ownKeys: function() {
+    return ["foo", "bar"];
+  }
+});
+
+Object.preventExtensions(target);
+
+assert.throws(TypeError, function() {
+  Object.keys(p);
+});
+
+reportCompare(0, 0);