1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/isExtensible/trap-is-undefined.js b/js/src/tests/test262/built-ins/Proxy/isExtensible/trap-is-undefined.js
new file mode 100644
index 0000000000..e95601b80f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/isExtensible/trap-is-undefined.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 9.5.3
+description: >
+    Return target.[[IsExtensible]]() if trap is undefined.
+info: |
+    [[IsExtensible]] ( )
+
+    ...
+    7. If trap is undefined, then
+        a. Return target.[[IsExtensible]]().
+    ...
+features: [Proxy]
+---*/
+
+var target = {};
+var p = new Proxy(target, {});
+
+assert.sameValue(Object.isExtensible(p), true);
+
+Object.preventExtensions(target);
+
+assert.sameValue(Object.isExtensible(p), false);
+
+reportCompare(0, 0);