arc-bridge: Add the ARC Bridge Service

components/arc/arc_bridge_service_unittest.cc

+// Copyright 2015 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 "components/arc/arc_bridge_service.h"
+
+#include "base/memory/ref_counted.h"
+#include "base/run_loop.h"
+#include "chromeos/arc/bridge/common/arc_host_messages.h"
+#include "ipc/ipc_channel.h"
+#include "ipc/ipc_channel_proxy.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace arc {
+
+namespace {
+
+// A fake sender that can connect to a specified IPC::ChannelHandle.
+class IPCSenderFake : public IPC::Listener,
+                      public IPC::Sender {
+ public:
+  IPCSenderFake()
+    : ipc_thread_("IPCSenderFake") {
+    ipc_thread_.StartWithOptions(
+        base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
+  }
+  ~IPCSenderFake() override {}
+
+  // Connects as a client to the specified |handle|.
+  bool Connect(const IPC::ChannelHandle& handle) {
+    ipc_channel_ = IPC::ChannelProxy::Create(handle,
+                                             IPC::Channel::MODE_CLIENT,
+                                             this,
+                                             ipc_thread_.task_runner().get());
+    if (!ipc_channel_)
+      return false;
+    return true;
+  }
+
+  bool Send(IPC::Message* msg) override {
+    return ipc_channel_->Send(msg);
+  }
+
+  bool OnMessageReceived(const IPC::Message& message) override {
+    return true;
+  }
+
+ private:
+  // Thread in which IPC messaging is performed.
+  base::Thread ipc_thread_;
+
+  // The channel through which messages are sent.
+  scoped_ptr<IPC::ChannelProxy> ipc_channel_;
+};
+
+}  // namespace
+
+class ArcBridgeTest : public testing::Test,
+                      public ArcBridgeService::Observer {
+ public:
+  ArcBridgeTest() {}

[satorux1, 2015/10/28 05:45:23]

Initialize ready_ here with ready_(false)? unitialized members should generally
be avoided.

[Luis Héctor Chávez, 2015/10/28 17:19:14]

Done.

+  ~ArcBridgeTest() override {}
+
+  void OnStateChanged(ArcBridgeService::State state) override {
+    if (state == ArcBridgeService::READY) {
+      ready_ = true;
+      message_loop_.Quit();
+    }
+  }
+
+  bool IsReady() { return ready_; }
+
+ protected:
+  scoped_ptr<IPCSenderFake> fake_sender_;
+
+ private:
+  void SetUp() override {
+    ready_ = false;
+    service_.reset(new ArcBridgeService(message_loop_.task_runner()));
+
+    service_->AddObserver(this);
+    service_->SetEnabled(true);
+
+    IPC::ChannelHandle handle(IPC::Channel::GenerateUniqueRandomChannelID());
+    EXPECT_TRUE(service_->Connect(handle, IPC::Channel::MODE_SERVER));

[hidehiko, 2015/10/28 17:48:45]

It'd be good to note that, for testing, we do not register the service to the
DBus.

[Luis Héctor Chávez, 2015/10/28 21:06:32]

Done.

+    fake_sender_.reset(new IPCSenderFake());
+    EXPECT_TRUE(fake_sender_);
+    EXPECT_TRUE(fake_sender_->Connect(handle));
+  }
+
+  void TearDown() override {
+    fake_sender_.reset();
+    service_->RemoveObserver(this);
+    service_.reset();

[satorux1, 2015/10/28 05:45:23]

do you need to reset fake_sender_ and service_ here? these are scoped_ptr, so
it's probably not necessary

[Luis Héctor Chávez, 2015/10/28 17:19:14]

It's not necessary, but I'd like to stop the threads in the TearDown() if
possible.

+  }
+
+  bool ready_;
+  base::MessageLoopForUI message_loop_;
+  scoped_ptr<ArcBridgeService> service_;
+};
+
+// Exercises the basic functionality of the ARC Bridge Service.  A message from
+// within the instance should cause the observer to be notified.
+TEST_F(ArcBridgeTest, Basic) {
+  EXPECT_FALSE(IsReady());

[hidehiko, 2015/10/28 17:48:45]

nit: maybe ASSERT_FALSE, as it does not make sense to continue the testing if
this condition is not satisfied?

[Luis Héctor Chávez, 2015/10/28 21:06:32]

Done.

+
+  EXPECT_TRUE(fake_sender_->Send(new ArcInstanceHostMsg_InstanceReady()));

[hidehiko, 2015/10/28 17:48:45]

ditto.

[Luis Héctor Chávez, 2015/10/28 21:06:32]

Done.

+
+  base::RunLoop run_loop;
+  run_loop.Run();
+
+  EXPECT_TRUE(IsReady());
+}
+
+}  // namespace arc