Object.getOwnPropertyNames should be free of duplicates

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 5017 matching lines @@
   value = CompileRun("Object.getOwnPropertyNames(object).length == 0");
   CHECK(value->IsTrue());
 
   context1->Exit();
   context0->Exit();
   context1.Dispose();
   context0.Dispose();
 }
 
 
+static v8::Handle<v8::Array> NamedPropertyEnumerator(const AccessorInfo& info) {
+  v8::Handle<v8::Array> result = v8::Array::New(1);
+  result->Set(0, v8_str("x"));
+  return result;
+}
+
+
+THREADED_TEST(GetOwnPropertyNamesWithInterceptor) {
+  v8::HandleScope handle_scope;
+  v8::Handle<v8::ObjectTemplate> obj_template = v8::ObjectTemplate::New();
+
+  obj_template->Set(v8_str("x"), v8::Integer::New(42));
+  obj_template->SetNamedPropertyHandler(NULL, NULL, NULL, NULL,
+                                        NamedPropertyEnumerator);
+  
+  LocalContext context;
+  v8::Handle<v8::Object> global = context->Global();
+  global->Set(v8_str("object"), obj_template->NewInstance());
+
+  v8::Handle<Value> value =
+      CompileRun("Object.getOwnPropertyNames(object).join(',')");
+  CHECK_EQ(v8_str("x"), value);
+}
+
+
 static v8::Handle<Value> ConstTenGetter(Local<String> name,
                                         const AccessorInfo& info) {
   return v8_num(10);
 }
 
 
 THREADED_TEST(CrossDomainAccessors) {
   v8::HandleScope handle_scope;
 
   v8::Handle<v8::FunctionTemplate> func_template = v8::FunctionTemplate::New();
@@ skipping 5874 matching lines @@
   const char* code =
       "(function() {"
       "  for (var i = 0; i < 2*16; i++) {"
       "    %_GetFromCache(0, 'a' + i);"
       "  };"
       "  return 'PASSED';"
       "})()";
   v8::internal::Heap::ClearJSFunctionResultCaches();
   ExpectString(code, "PASSED");
 }