1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/tests/non262/Proxy/proxy-__proto__.js b/js/src/tests/non262/Proxy/proxy-__proto__.js
new file mode 100644
index 0000000000..f68bea489b
--- /dev/null
+++ b/js/src/tests/non262/Proxy/proxy-__proto__.js
@@ -0,0 +1,59 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var gTestfile = 'proxy-__proto__.js';
+var BUGNUMBER = 950407;
+var summary = "Behavior of __proto__ on ES6 proxies";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var protoDesc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
+var protoGetter = protoDesc.get;
+var protoSetter = protoDesc.set;
+
+function testProxy(target, initialProto)
+{
+  print("Now testing behavior for new Proxy(" + ("" + target) + ", {})");
+
+  var pobj = new Proxy(target, {});
+
+  // Check [[Prototype]] before attempted mutation
+  assertEq(Object.getPrototypeOf(pobj), initialProto);
+  assertEq(protoGetter.call(pobj), initialProto);
+
+  // Attempt [[Prototype]] mutation
+  protoSetter.call(pobj, null);
+
+  // Check [[Prototype]] after attempted mutation
+  assertEq(Object.getPrototypeOf(pobj), null);
+  assertEq(protoGetter.call(pobj), null);
+  assertEq(Object.getPrototypeOf(target), null);
+}
+
+// Proxy object with non-null [[Prototype]]
+var nonNullProto = { toString: function() { return "non-null prototype"; } };
+var target = Object.create(nonNullProto);
+testProxy(target, nonNullProto);
+
+// Proxy object with null [[Prototype]]
+target = Object.create(null);
+target.toString = function() { return "null prototype" };
+testProxy(target, null);
+
+// Proxy function with [[Call]]
+var callForCallOnly = function () { };
+callForCallOnly.toString = function() { return "callable target"; };
+testProxy(callForCallOnly, Function.prototype);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");