Video Capture Mojo (1.4b): Implement ability to use fake device instance

services/video_capture/fake_device_video_capture_service_test.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 "services/video_capture/fake_device_video_capture_service_test.h"
+
+#include "base/run_loop.h"
+
+using testing::_;
+using testing::Invoke;
+
+namespace video_capture {
+
+FakeDeviceVideoCaptureServiceTest::FakeDeviceVideoCaptureServiceTest()
+    : VideoCaptureServiceTest() {}
+
+FakeDeviceVideoCaptureServiceTest::~FakeDeviceVideoCaptureServiceTest() =
+    default;
+
+void FakeDeviceVideoCaptureServiceTest::SetUp() {
+  VideoCaptureServiceTest::SetUp();
+
+  base::RunLoop wait_loop;
+  mojom::VideoCaptureDeviceDescriptorPtr fake_device_descriptor;
+  EXPECT_CALL(descriptor_receiver_, OnEnumerateDeviceDescriptorsCallback(_))
+      .WillOnce(Invoke([&wait_loop, &fake_device_descriptor](
+          const std::vector<mojom::VideoCaptureDeviceDescriptorPtr>&
+              descriptors) {
+        fake_device_descriptor = descriptors[0].Clone();
+        wait_loop.Quit();
+      }));
+  factory_->EnumerateDeviceDescriptors(base::Bind(
+      &MockDeviceDescriptorReceiver::HandleEnumerateDeviceDescriptorsCallback,
+      base::Unretained(&descriptor_receiver_)));
+  wait_loop.Run();
+
+  factory_->CreateDeviceProxy(
+      std::move(fake_device_descriptor), mojo::GetProxy(&fake_device_proxy_),
+      base::Bind([](mojom::DeviceAccessResultCode result_code) {
+        ASSERT_EQ(mojom::DeviceAccessResultCode::SUCCESS, result_code);
+      }));
+}
+
+}  // namespace video_capture