add a default value for return value

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 10f8af1d4cf72ee2ab618448eb4e64fbd301cc8d..a69fe902a4293740a692416e4f4b5c0b57b08f5c 100755
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -810,6 +810,13 @@ static void CheckReturnValue(const T& t) {
   CHECK_EQ(v8::Isolate::GetCurrent(), t.GetIsolate());
   CHECK_EQ(t.GetIsolate(), rv.GetIsolate());
   CHECK((*o)->IsTheHole() || (*o)->IsUndefined());
+  // Verify reset
+  bool is_runtime = (*o)->IsTheHole();
+  rv.Set(true);
+  CHECK(!(*o)->IsTheHole() && !(*o)->IsUndefined());
+  rv.Set(v8::Handle<v8::Object>());
+  CHECK((*o)->IsTheHole() || (*o)->IsUndefined());
+  CHECK_EQ(is_runtime, (*o)->IsTheHole());
 }
 
 static v8::Handle<Value> handle_call(const v8::Arguments& args) {