Reapply http://code.google.com/p/v8/source/detail?r=6555

test/cctest/test-api.cc

 // Copyright 2007-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 12505 matching lines @@
 
   v8::TryCatch try_catch;
   re = v8::RegExp::New(v8_str("foo["), v8::RegExp::kNone);
   CHECK(re.IsEmpty());
   CHECK(try_catch.HasCaught());
   context->Global()->Set(v8_str("ex"), try_catch.Exception());
   ExpectTrue("ex instanceof SyntaxError");
 }
 
 
+THREADED_TEST(Equals) {
+  v8::HandleScope handleScope;
+  LocalContext localContext;
+
+  v8::Handle<v8::Object> globalProxy = localContext->Global();
+  v8::Handle<Value> global = globalProxy->GetPrototype();
+
+  CHECK(global->StrictEquals(global));
+  CHECK(!global->StrictEquals(globalProxy));
+  CHECK(!globalProxy->StrictEquals(global));
+  CHECK(globalProxy->StrictEquals(globalProxy));
+
+  CHECK(global->Equals(global));
+  CHECK(!global->Equals(globalProxy));
+  CHECK(!globalProxy->Equals(global));
+  CHECK(globalProxy->Equals(globalProxy));
+}
+
+
 static v8::Handle<v8::Value> Getter(v8::Local<v8::String> property,
                                     const v8::AccessorInfo& info ) {
   return v8_str("42!");
 }
 
 
 static v8::Handle<v8::Array> Enumerator(const v8::AccessorInfo& info) {
   v8::Handle<v8::Array> result = v8::Array::New();
   result->Set(0, v8_str("universalAnswer"));
   return result;
@@ skipping 22 matching lines @@
   v8::Handle<v8::Function> define_property =
       CompileRun("(function() {"
                  "  Object.defineProperty("
                  "    this,"
                  "    1,"
                  "    { configurable: true, enumerable: true, value: 3 });"
                  "})").As<Function>();
   context->DetachGlobal();
   define_property->Call(proxy, 0, NULL);
 }