[Mojo Video Capture] Stop service when last client disconnects.

services/video_capture/test/service_unittest.cc

 // Copyright 2016 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/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "base/test/mock_callback.h"
+#include "services/video_capture/public/interfaces/constants.mojom.h"
 #include "services/video_capture/public/interfaces/device_factory.mojom.h"
 #include "services/video_capture/test/service_test.h"
 
 using testing::Exactly;
 using testing::_;
 using testing::Invoke;
 using testing::InvokeWithoutArgs;
 
 namespace video_capture {
 
@@ skipping 42 matching lines @@
               Run(mojom::DeviceAccessResultCode::ERROR_DEVICE_NOT_FOUND))
       .Times(1)
       .WillOnce(InvokeWithoutArgs([&wait_loop]() { wait_loop.Quit(); }));
   factory_->GetDeviceInfos(device_info_receiver_.Get());
   factory_->CreateDevice(invalid_device_id,
                          mojo::MakeRequest(&fake_device_proxy),
                          create_device_proxy_callback.Get());
   wait_loop.Run();
 }
 
+// Tests that the service requests to be closed when the last client disconnects
+// after not having done anything other than obtaining a connection to the
+// fake device factory.
+TEST_F(VideoCaptureServiceTest, ServiceQuitsWhenNoClientConnected) {
+  base::RunLoop wait_loop;
+  EXPECT_CALL(*service_state_observer_, OnServiceStopped(_))
+      .WillOnce(Invoke([&wait_loop](const service_manager::Identity& identity) {
+        if (identity.name() == mojom::kServiceName)
+          wait_loop.Quit();
+      }));
+
+  // Exercise: Disconnect from service by discarding our references to it.
+  factory_.reset();
+  service_.reset();
+
+  wait_loop.Run();
+}
+
 }  // namespace video_capture