[api] Introduce MicrotasksScope::IsRunningMicrotasks

test/cctest/test-api.cc

 // Copyright 2012 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 20867 matching lines @@
 
 TEST(CallCompletedCallbackTwoExceptions) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
   env->GetIsolate()->AddCallCompletedCallback(CallCompletedCallbackException);
   CompileRun("throw 'first exception';");
 }
 
 
 static void MicrotaskOne(const v8::FunctionCallbackInfo<Value>& info) {
+  CHECK(v8::MicrotasksScope::IsRunningMicrotasks(info.GetIsolate()));
   v8::HandleScope scope(info.GetIsolate());
   v8::MicrotasksScope microtasks(info.GetIsolate(),
                                  v8::MicrotasksScope::kDoNotRunMicrotasks);
   CompileRun("ext1Calls++;");
 }
 
 
 static void MicrotaskTwo(const v8::FunctionCallbackInfo<Value>& info) {
+  CHECK(v8::MicrotasksScope::IsRunningMicrotasks(info.GetIsolate()));
   v8::HandleScope scope(info.GetIsolate());
   v8::MicrotasksScope microtasks(info.GetIsolate(),
                                  v8::MicrotasksScope::kDoNotRunMicrotasks);
   CompileRun("ext2Calls++;");
 }
 
 
 void* g_passed_to_three = NULL;
 
 
 static void MicrotaskThree(void* data) {
   g_passed_to_three = data;
 }
 
 
 TEST(EnqueueMicrotask) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
+  CHECK(!v8::MicrotasksScope::IsRunningMicrotasks(env->GetIsolate()));
   CompileRun(
       "var ext1Calls = 0;"
       "var ext2Calls = 0;");
   CompileRun("1+1;");
   CHECK_EQ(0, CompileRun("ext1Calls")->Int32Value(env.local()).FromJust());
   CHECK_EQ(0, CompileRun("ext2Calls")->Int32Value(env.local()).FromJust());
 
   env->GetIsolate()->EnqueueMicrotask(
       Function::New(env.local(), MicrotaskOne).ToLocalChecked());
   CompileRun("1+1;");
@@ skipping 4043 matching lines @@
 }
 
 TEST(PrivateForApiIsNumber) {
   LocalContext context;
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
 
   // Shouldn't crash.
   v8::Private::ForApi(isolate, v8_str("42"));
 }