1 files changed, 56 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/setPrototypeOf/not-extensible-target-same-target-prototype.js b/js/src/tests/test262/built-ins/Proxy/setPrototypeOf/not-extensible-target-same-target-prototype.js
new file mode 100644
index 0000000000..8910a2ddcd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/setPrototypeOf/not-extensible-target-same-target-prototype.js
@@ -0,0 +1,56 @@
+// 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-setprototypeof-v
+description: >
+  Handler can only return true for non-extensible targets if the given prototype
+  is the same as target's prototype
+info: |
+  [[SetPrototypeOf]] (V)
+
+  12. Let targetProto be ? target.[[GetPrototypeOf]]().
+  13. If SameValue(V, targetProto) is false, throw a TypeError exception.
+  14. Return true.
+features: [Proxy, Reflect, Reflect.setPrototypeOf]
+---*/
+
+var proto = {};
+var target = Object.setPrototypeOf({}, proto);
+
+Object.preventExtensions(target);
+
+var proxy;
+
+proxy = new Proxy(target, {
+  setPrototypeOf: function() {
+    return true;
+  }
+});
+
+assert.sameValue(
+  Reflect.setPrototypeOf(proxy, proto),
+  true,
+  "prototype arg is the same in target"
+);
+
+var outro = {};
+proxy = new Proxy(outro, {
+  setPrototypeOf: function(t, p) {
+    Object.setPrototypeOf(t, p);
+    Object.preventExtensions(t);
+    return true;
+  }
+});
+
+assert.sameValue(
+  Reflect.setPrototypeOf(proxy, proto),
+  true,
+  "prototype is set to target inside handler trap"
+);
+assert.sameValue(
+  Object.getPrototypeOf(outro),
+  proto,
+  "target has the custom set prototype"
+);
+
+reportCompare(0, 0);