[Chromoting] Introducing refcount-based life time management of the message loops in the service (d…

remoting/base/auto_thread_task_runner_unittest.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop.h"
+#include "base/threading/thread.h"
+#include "remoting/base/auto_thread_task_runner.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+void PostQuitTask(MessageLoop* message_loop) {
+  message_loop->PostTask(FROM_HERE, MessageLoop::QuitClosure());
+}
+
+void ReleaseTaskRunner(
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner) {

[Wez, 2012/09/04 18:09:38]

This method is actually used to keep the TaskRunner alive until the task is
processed, not to release it; if the intent is to mimic the case where there is
an outstanding task referring to the TaskRunner & keeping it alive, call this
DummyTask, say?

[alexeypa (please no reviews), 2012/09/04 18:42:53]

Done.

+  // Do nothing. |task_runner| will be released once the function exits.
+}
+
+}  // namespace
+
+namespace remoting {
+
+TEST(AutoThreadTaskRunnerTest, StartAndStopMain) {
+  // Create a task runner.
+  MessageLoop message_loop;
+  scoped_refptr<AutoThreadTaskRunner> task_runner =
+      new AutoThreadTaskRunner(
+          message_loop.message_loop_proxy(),
+          base::Bind(&PostQuitTask, &message_loop));
+
+  // Release the task runner to stop it.
+  message_loop.PostTask(
+      FROM_HERE, base::Bind(&ReleaseTaskRunner, task_runner));

[Wez, 2012/09/04 18:09:38]

Do you actually need this? When you NULL |task_runner|, won't that post the quit
task, which |message_loop.Run()| will process and quit?

[alexeypa (please no reviews), 2012/09/04 18:42:53]

Done.

+  task_runner = NULL;
+
+  message_loop.Run();

[Wez, 2012/09/04 18:09:38]

If your test is successful it'll exit almost immediately; if not then it'll run
indefinitely; you could PostDelayedTask() with a delay of a few seconds and set
a failing expectation in there, for example.

[alexeypa (please no reviews), 2012/09/04 18:42:53]

I added a test to make sure that the posted task has been executed.

+}
+
+TEST(AutoThreadTaskRunnerTest, StartAndStopWorker) {
+  // Create a task runner.
+  MessageLoop message_loop;
+  scoped_refptr<AutoThreadTaskRunner> task_runner =
+      new AutoThreadTaskRunner(
+          message_loop.message_loop_proxy(),
+          base::Bind(&PostQuitTask, &message_loop));
+
+  // Create a child task runner.
+  base::Thread thread("Child task runner");
+  thread.Start();
+  task_runner = new AutoThreadTaskRunner(thread.message_loop_proxy(),
+                                         task_runner);
+
+  // Release the child runner to stop both runners.
+  message_loop.PostTask(
+      FROM_HERE, base::Bind(&ReleaseTaskRunner, task_runner));

[Wez, 2012/09/04 18:09:38]

See above.

[alexeypa (please no reviews), 2012/09/04 18:42:53]

Done.

+  task_runner = NULL;
+
+  message_loop.Run();
+  thread.Stop();
+}
+
+}  // namespace remoting