Object.observe: test mutating an object via the API

test/cctest/cctest.h

Index: test/cctest/cctest.h
diff --git a/test/cctest/cctest.h b/test/cctest/cctest.h
index 88cb9b8c5d93a2726977445ce10ddf78df64ffad..283cbccbceb47490efabbb5309cc4aafe65340e6 100644
--- a/test/cctest/cctest.h
+++ b/test/cctest/cctest.h
@@ -252,5 +252,12 @@ static inline void SimulateFullSpace(v8::internal::PagedSpace* space) {
   space->ClearStats();
 }
 
+static inline void ExpectString(const char* code, const char* expected) {
+  v8::Local<v8::Value> result = CompileRun(code);
+  CHECK(result->IsString());
+  v8::String::AsciiValue ascii(result);
+  CHECK_EQ(expected, *ascii);
+}
+
 
 #endif  // ifndef CCTEST_H_