Unit test for WebMediaPlayerMS

content/renderer/media/webmediaplayer_ms_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 "base/bind.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "cc/layers/video_frame_provider.h"
+#include "content/public/renderer/media_stream_renderer_factory.h"
+#include "content/public/renderer/video_frame_provider.h"
+#include "content/renderer/media/mock_media_constraint_factory.h"
+#include "content/renderer/media/render_media_log.h"
+#include "content/renderer/media/webmediaplayer_ms.h"
+#include "content/renderer/media/webrtc_audio_renderer.h"
+#include "content/renderer/render_frame_impl.h"
+#include "media/base/gmock_callback_support.h"
+#include "media/base/mock_filters.h"
+#include "media/base/test_helpers.h"
+#include "media/base/video_frame.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "third_party/WebKit/public/platform/WebMediaPlayer.h"
+#include "third_party/WebKit/public/platform/WebMediaPlayerClient.h"
+#include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"

[mcasas, 2015/10/21 19:54:02]

Needed?

(check all header please).

[qiangchen, 2015/10/22 17:22:58]

Done.

Looks like many includes are included in test_helpers.h

+
+namespace content {
+
+class WebMediaPlayerMSTest;
+
+class MockCB {

[mcasas, 2015/10/21 19:54:02]

There's indeed plenty of Mock/Test dependent classes.

Check if you can find some other Mocks in other parts,
if not (which I assume is the case), and you foresee this
mocks/test classes to be reused, we can create a test
utils file. Otherwise I'm afraid we'll have to keep them :)

[qiangchen, 2015/10/22 17:22:58]

My investigation shows only content::VideoFrameProvider has a test subclass. But
that test class can only generate frames at constant rate, and has no concept of
special frames like "test brake" which is needed in our test case.

All other classes has no test subclass at all.

For reusability, I can only foresee that ReusableMessageLoopEvent could be used
elsewhere. 

What's your opinion on where we should put those classes?

+ public:
+  MOCK_METHOD0(StartRendering, void());
+  MOCK_METHOD0(StopRendering, void());
+
+  MOCK_METHOD1(NetworkStateChanged, void(blink::WebMediaPlayer::NetworkState));
+  MOCK_METHOD1(ReadyStateChanged, void(blink::WebMediaPlayer::ReadyState));
+  void VerifyAndClearExpectations() {
+    // Note: the raw value of "this" could be different from &mock_cb_.
+    // So this is not equivalent with calling
+    // VerifyAndClearExpectations(&mock_cb_) outside.
+    testing::Mock::VerifyAndClearExpectations(this);
+  }
+};
+
+struct TestFrame {
+  enum TestFrameType {
+    NORMAL_FRAME,
+    BROKEN_FRAME,
+    TEST_BRAKE  // Signal to pause message loop.
+  };
+  TestFrame(TestFrameType input_category,
+            const scoped_refptr<media::VideoFrame>& input_frame)
+      : category(input_category), frame(input_frame) {}
+
+  TestFrameType category;
+  scoped_refptr<media::VideoFrame> frame;
+};
+
+class ReusableMessageLoopEvent {
+ public:
+  ReusableMessageLoopEvent() : event_(new media::WaitableMessageLoopEvent()) {}
+
+  base::Closure GetClosure() { return event_->GetClosure(); }
+
+  media::PipelineStatusCB GetPipelineStatusCB() {
+    return event_->GetPipelineStatusCB();
+  }
+
+  void RunAndWait() {
+    event_->RunAndWait();
+    event_.reset(new media::WaitableMessageLoopEvent());
+  }
+
+  void RunAndWaitForStatus(media::PipelineStatus expected) {
+    event_->RunAndWaitForStatus(expected);
+    event_.reset(new media::WaitableMessageLoopEvent());
+  }
+
+ private:
+  scoped_ptr<media::WaitableMessageLoopEvent> event_;
+};
+
+// The class mainly used to inject VideoFrames into WebMediaPlayerMS.
+class MockVideoFrameProvider : public VideoFrameProvider {
+ public:
+  MockVideoFrameProvider(base::MessageLoop* message_loop,
+                         ReusableMessageLoopEvent* message_loop_controller,
+                         const base::Closure& error_cb,
+                         const VideoFrameProvider::RepaintCB& repaint_cb)
+      : started_(false),
+        message_loop_(message_loop),
+        message_loop_controller_(message_loop_controller),
+        error_cb_(error_cb),
+        repaint_cb_(repaint_cb),
+        delay_(base::TimeDelta::FromSecondsD(1.0 / 30.0)) {}
+
+  // Implementation of VideoFrameProvider
+  void Start() override;
+  void Stop() override;
+  void Play() override;
+  void Pause() override;
+
+  // Methods for test use
+  void QueueFrames(const std::string& str);

[mcasas, 2015/10/21 19:54:02]

I don't see much added value in creating/passing the Frame 
input array as a parsed string, and adds more complexity,
why not a static array of timestamps and using negative 
numbers for markers?

[qiangchen, 2015/10/22 17:22:58]

Done.

+  void PrepareFrame(TestFrame::TestFrameType category,
+                    const scoped_refptr<media::VideoFrame>& frame);
+  bool Started();
+  bool Paused();
+
+ private:
+  ~MockVideoFrameProvider() override {}
+
+  // Main function that pushes frame into WebMediaPlayerMS
+  void InjectFrame();
+
+  bool started_;
+  bool paused_;
+
+  base::MessageLoop* message_loop_;
+  ReusableMessageLoopEvent* message_loop_controller_;
+  base::Closure error_cb_;
+  VideoFrameProvider::RepaintCB repaint_cb_;
+
+  std::deque<TestFrame> frames_;
+  base::TimeDelta delay_;
+};
+
+// The class is used to generate MockVideoProvider
+class MockRenderFactory : public MediaStreamRendererFactory {
+ public:
+  MockRenderFactory(base::MessageLoop* message_loop,
+                    ReusableMessageLoopEvent* message_loop_controller)
+      : message_loop_(message_loop),
+        message_loop_controller_(message_loop_controller) {}
+
+  scoped_refptr<VideoFrameProvider> GetVideoFrameProvider(
+      const GURL& url,
+      const base::Closure& error_cb,
+      const VideoFrameProvider::RepaintCB& repaint_cb,
+      const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
+      const scoped_refptr<base::TaskRunner>& worker_task_runner,
+      media::GpuVideoAcceleratorFactories* gpu_factories) override;
+
+  MockVideoFrameProvider* GetVideoFrameProvider();
+
+  scoped_refptr<MediaStreamAudioRenderer> GetAudioRenderer(
+      const GURL& url,
+      int render_frame_id,
+      const std::string& device_id,
+      const url::Origin& security_origin) override;
+
+ private:
+  base::MessageLoop* message_loop_;
+  scoped_refptr<VideoFrameProvider> provider_;
+  ReusableMessageLoopEvent* message_loop_controller_;
+};
+
+// The class is responsible to pull frames from WebMediaPlayerMS
+class MockVideoFrameProviderClient : public cc::VideoFrameProvider::Client {
+ public:
+  MockVideoFrameProviderClient(base::MessageLoop* message_loop,
+                               cc::VideoFrameProvider* compositor,
+                               MockCB* mock_cb)
+      : rendering_(false),
+        background_rendering_(false),
+        message_loop_(message_loop),
+        compositor_(compositor),
+        mock_cb_(mock_cb) {}
+
+  // Implementation of cc::VideoFrameProvider::Client
+  void StopUsingProvider() override;
+  void StartRendering() override;
+  void StopRendering() override;
+  void DidReceiveFrame() override {}
+  void DidUpdateMatrix(const float* matrix) override {}
+
+  // For test use
+  void SetBackgroundRendering(bool background_rendering);
+
+ private:
+  // Main function trying to ask WebMediaPlayerMS to submit a frame for
+  // rendering.
+  void RenderFrame();
+
+  bool rendering_;
+  bool background_rendering_;
+  base::MessageLoop* message_loop_;
+  cc::VideoFrameProvider* compositor_;
+  MockCB* mock_cb_;
+};
+
+// This class is used to respond to WebMediaPlayerMS status change.
+class MockClient : public blink::WebMediaPlayerClient {
+ public:
+  MockClient(WebMediaPlayerMSTest* test,
+             WebMediaPlayerMS* player,
+             base::MessageLoop* message_loop,
+             ReusableMessageLoopEvent* message_loop_controller)
+      : test_(test),
+        player_(player),
+        message_loop_(message_loop),
+        message_loop_controller_(message_loop_controller),
+        compositor_(nullptr) {}
+  ~MockClient() {}
+
+  // Implementation of WebMediaPlayerClient
+  void networkStateChanged() override;
+  void readyStateChanged() override;
+  void timeChanged() override {}
+  void repaint() override {}
+  void durationChanged() override {}
+  void sizeChanged() override {}
+  void playbackStateChanged() override {}
+  void setWebLayer(blink::WebLayer* layer) override;
+  blink::WebMediaPlayer::TrackId addAudioTrack(const blink::WebString& id,
+                                               AudioTrackKind,
+                                               const blink::WebString& label,
+                                               const blink::WebString& language,
+                                               bool enabled) override;
+  void removeAudioTrack(blink::WebMediaPlayer::TrackId) override {}
+  blink::WebMediaPlayer::TrackId addVideoTrack(const blink::WebString& id,
+                                               VideoTrackKind,
+                                               const blink::WebString& label,
+                                               const blink::WebString& language,
+                                               bool selected) override;
+  void removeVideoTrack(blink::WebMediaPlayer::TrackId) override {}
+  void addTextTrack(blink::WebInbandTextTrack*) override {}
+  void removeTextTrack(blink::WebInbandTextTrack*) override {}
+  void mediaSourceOpened(blink::WebMediaSource*) override {}
+  void requestSeek(double) override {}
+  void remoteRouteAvailabilityChanged(bool) override {}
+  void connectedToRemoteDevice() override {}
+  void disconnectedFromRemoteDevice() override {}
+
+  // For test use
+  MockVideoFrameProviderClient* GetVideoFrameProviderClient();
+
+ private:
+  WebMediaPlayerMSTest* test_;
+  WebMediaPlayerMS* player_;
+  base::MessageLoop* message_loop_;
+  ReusableMessageLoopEvent* message_loop_controller_;
+  cc::VideoFrameProvider* compositor_;
+  scoped_ptr<MockVideoFrameProviderClient> video_frame_provider_client_;
+};
+
+class WebMediaPlayerMSTest : public testing::Test {
+ public:
+  WebMediaPlayerMSTest()
+      : client_(this, &player_, &message_loop_, &message_loop_controller_),
+        render_factory_(
+            new MockRenderFactory(&message_loop_, &message_loop_controller_)),
+        player_(nullptr,
+                &client_,
+                base::WeakPtr<RenderFrameImpl>(),
+                new media::MediaLog(),
+                scoped_ptr<MediaStreamRendererFactory>(render_factory_),
+                message_loop_.task_runner(),
+                message_loop_.task_runner(),
+                message_loop_.task_runner(),
+                nullptr) {}
+  ~WebMediaPlayerMSTest() override {}
+
+  MockVideoFrameProvider* LoadAndGetFrameProvider(bool algorithm_enabled);
+  cc::VideoFrameProvider* GetCompositorForTest();
+  MockCB* GetMockCB();
+
+ protected:
+  // Use StrictMock<T> to catch missing/extra callbacks.
+  testing::StrictMock<MockCB> mock_cb_;
+
+  base::MessageLoop message_loop_;
+  MockClient client_;
+  MockRenderFactory* render_factory_;
+  WebMediaPlayerMS player_;
+  cc::VideoFrameProvider* compositor_;
+
+  ReusableMessageLoopEvent message_loop_controller_;
+};
+
+MockVideoFrameProvider* WebMediaPlayerMSTest::LoadAndGetFrameProvider(
+    bool algorithm_enabled) {
+  MockVideoFrameProvider* provider = render_factory_->GetVideoFrameProvider();
+  EXPECT_EQ(nullptr, provider);
+
+  EXPECT_CALL(mock_cb_,
+              NetworkStateChanged(blink::WebMediaPlayer::NetworkStateLoading));
+  EXPECT_CALL(mock_cb_,
+              ReadyStateChanged(blink::WebMediaPlayer::ReadyStateHaveNothing));
+  compositor_ = player_.LoadForTesting(algorithm_enabled);
+
+  provider = render_factory_->GetVideoFrameProvider();
+  EXPECT_NE(nullptr, provider);
+  EXPECT_TRUE(provider->Started());
+
+  mock_cb_.VerifyAndClearExpectations();
+  return provider;
+}
+
+cc::VideoFrameProvider* WebMediaPlayerMSTest::GetCompositorForTest() {
+  return compositor_;
+}
+
+MockCB* WebMediaPlayerMSTest::GetMockCB() {
+  return &mock_cb_;
+}
+
+void MockVideoFrameProvider::Start() {
+  started_ = true;
+  paused_ = false;
+  message_loop_->PostTask(
+      FROM_HERE,
+      base::Bind(&MockVideoFrameProvider::InjectFrame, base::Unretained(this)));
+}
+
+void MockVideoFrameProvider::Stop() {
+  started_ = false;
+  frames_.clear();
+}
+
+void MockVideoFrameProvider::Play() {
+  CHECK(started_);
+  paused_ = false;
+}
+
+void MockVideoFrameProvider::Pause() {
+  CHECK(started_);
+  paused_ = true;
+}
+
+void MockVideoFrameProvider::PrepareFrame(
+    TestFrame::TestFrameType category,
+    const scoped_refptr<media::VideoFrame>& frame) {
+  frames_.push_back(TestFrame(category, frame));
+}
+
+void MockVideoFrameProvider::QueueFrames(const std::string& str) {
+  for (const std::string& token : base::SplitString(
+           str, " ", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
+    if (token == "error") {
+      PrepareFrame(TestFrame::TestFrameType::BROKEN_FRAME, nullptr);
+      continue;
+    }
+    if (token == "brake") {
+      PrepareFrame(TestFrame::TestFrameType::TEST_BRAKE, nullptr);
+      continue;
+    }
+
+    int timestamp_in_ms = 0;
+    if (base::StringToInt(token, &timestamp_in_ms)) {
+      gfx::Size natural_size = media::TestVideoConfig::NormalCodedSize();
+      auto frame = media::VideoFrame::CreateFrame(
+          media::PIXEL_FORMAT_YV12, natural_size, gfx::Rect(natural_size),
+          natural_size, base::TimeDelta::FromMilliseconds(timestamp_in_ms));
+
+      frame->metadata()->SetTimeTicks(
+          media::VideoFrameMetadata::Key::REFERENCE_TIME,
+          base::TimeTicks::Now() +
+              base::TimeDelta::FromMilliseconds(timestamp_in_ms));
+
+      PrepareFrame(TestFrame::TestFrameType::NORMAL_FRAME, frame);
+      continue;
+    }
+
+    CHECK(false) << "Unrecognized token: " << token;
+  }
+}
+
+bool MockVideoFrameProvider::Started() {
+  return started_;
+}
+
+bool MockVideoFrameProvider::Paused() {
+  return paused_;
+}
+
+void MockVideoFrameProvider::InjectFrame() {
+  if (!started_)
+    return;
+
+  if (frames_.empty()) {
+    message_loop_controller_->GetClosure().Run();
+    return;
+  }
+
+  auto frame = frames_.front();
+  frames_.pop_front();
+
+  if (frame.category == TestFrame::TestFrameType::BROKEN_FRAME) {
+    error_cb_.Run();
+    return;
+  }
+
+  // For pause case, the provider will still let the stream continue, but
+  // not send the frames to the player. As is the same case in reality.
+  if (frame.category == TestFrame::TestFrameType::NORMAL_FRAME) {
+    if (!paused_)
+      repaint_cb_.Run(frame.frame);
+
+    size_t i = 0;
+    while (i < frames_.size() &&
+           frames_[i].category != TestFrame::TestFrameType::NORMAL_FRAME) {
+      ++i;
+    }
+
+    if (i < frames_.size()) {
+      delay_ =
+          (frames_[i].frame->timestamp() - frame.frame->timestamp()) / (i + 1);
+    }
+  }
+
+  message_loop_->PostDelayedTask(
+      FROM_HERE,
+      base::Bind(&MockVideoFrameProvider::InjectFrame, base::Unretained(this)),
+      delay_);
+
+  if (frame.category == TestFrame::TestFrameType::TEST_BRAKE)
+    message_loop_controller_->GetClosure().Run();
+}
+
+scoped_refptr<VideoFrameProvider> MockRenderFactory::GetVideoFrameProvider(
+    const GURL& url,
+    const base::Closure& error_cb,
+    const VideoFrameProvider::RepaintCB& repaint_cb,
+    const scoped_refptr<base::SingleThreadTaskRunner>& /*media_task_runner*/,
+    const scoped_refptr<base::TaskRunner>& /*worker_task_runner*/,
+    media::GpuVideoAcceleratorFactories* /*gpu_factories*/) {
+  provider_ = new MockVideoFrameProvider(
+      message_loop_, message_loop_controller_, error_cb, repaint_cb);
+
+  return provider_;
+}
+
+MockVideoFrameProvider* MockRenderFactory::GetVideoFrameProvider() {
+  return static_cast<MockVideoFrameProvider*>(provider_.get());
+}
+
+scoped_refptr<MediaStreamAudioRenderer> MockRenderFactory::GetAudioRenderer(
+    const GURL& url,
+    int render_frame_id,
+    const std::string& device_id,
+    const url::Origin& security_origin) {
+  return nullptr;
+}
+
+void MockClient::networkStateChanged() {
+  blink::WebMediaPlayer::NetworkState state = player_->networkState();
+  test_->GetMockCB()->NetworkStateChanged(state);
+  if (state == blink::WebMediaPlayer::NetworkState::NetworkStateFormatError ||
+      state == blink::WebMediaPlayer::NetworkState::NetworkStateDecodeError ||
+      state == blink::WebMediaPlayer::NetworkState::NetworkStateNetworkError)
+    message_loop_controller_->GetPipelineStatusCB().Run(
+        media::PipelineStatus::PIPELINE_ERROR_NETWORK);
+}
+
+void MockClient::readyStateChanged() {
+  blink::WebMediaPlayer::ReadyState state = player_->readyState();
+  test_->GetMockCB()->ReadyStateChanged(state);
+  if (state == blink::WebMediaPlayer::ReadyState::ReadyStateHaveEnoughData)
+    player_->play();
+}
+
+blink::WebMediaPlayer::TrackId MockClient::addAudioTrack(
+    const blink::WebString& id,
+    AudioTrackKind,
+    const blink::WebString& label,
+    const blink::WebString& language,
+    bool enabled) {
+  return 0;
+}
+
+blink::WebMediaPlayer::TrackId MockClient::addVideoTrack(
+    const blink::WebString& id,
+    VideoTrackKind,
+    const blink::WebString& label,
+    const blink::WebString& language,
+    bool selected) {
+  return 0;
+}
+
+void MockVideoFrameProviderClient::StopUsingProvider() {
+  if (rendering_)
+    StopRendering();
+  compositor_ = nullptr;
+}
+
+void MockVideoFrameProviderClient::StartRendering() {
+  if (!rendering_) {
+    rendering_ = true;
+    message_loop_->PostTask(
+        FROM_HERE, base::Bind(&MockVideoFrameProviderClient::RenderFrame,
+                              base::Unretained(this)));
+  }
+  mock_cb_->StartRendering();
+}
+
+void MockVideoFrameProviderClient::StopRendering() {
+  rendering_ = false;
+  mock_cb_->StopRendering();
+}
+
+void MockVideoFrameProviderClient::SetBackgroundRendering(
+    bool background_rendering) {
+  background_rendering_ = background_rendering;
+}
+
+void MockVideoFrameProviderClient::RenderFrame() {
+  if (!rendering_ || !compositor_)
+    return;
+
+  base::TimeTicks now = base::TimeTicks::Now();
+  base::TimeTicks deadline_min =
+      now + base::TimeDelta::FromSecondsD(1.0 / 60.0);
+  base::TimeTicks deadline_max =
+      deadline_min + base::TimeDelta::FromSecondsD(1.0 / 60.0);
+
+  // Background rendering is different from stop rendering. The rendering loop
+  // is still running but we do not ask frames from compositor_. And background
+  // rendering is not initiated from compositor_.
+  if (!background_rendering_) {
+    compositor_->UpdateCurrentFrame(deadline_min, deadline_max);
+    auto frame = compositor_->GetCurrentFrame();
+    compositor_->PutCurrentFrame();
+  }
+  message_loop_->PostDelayedTask(
+      FROM_HERE, base::Bind(&MockVideoFrameProviderClient::RenderFrame,
+                            base::Unretained(this)),
+      base::TimeDelta::FromSecondsD(1.0 / 60.0));
+}
+
+void MockClient::setWebLayer(blink::WebLayer* layer) {
+  if (layer) {
+    compositor_ = test_->GetCompositorForTest();
+    video_frame_provider_client_.reset(new MockVideoFrameProviderClient(
+        message_loop_, compositor_, test_->GetMockCB()));
+    compositor_->SetVideoFrameProviderClient(
+        video_frame_provider_client_.get());
+  }
+}
+
+MockVideoFrameProviderClient* MockClient::GetVideoFrameProviderClient() {
+  return video_frame_provider_client_.get();
+}
+
+TEST_F(WebMediaPlayerMSTest, Playing_Normal) {
+  // Workflow:
+  // 1. WMPMS::Load will generate and start content::VideoFrameProvider.
+  // 2. content::VideoFrameProvider will start pushing frames into WMPMS
+  //    repeatedly.
+  // 3. On WMPMS receiving the first frame, a WebLayer will be created.
+  // 4. The WebLayer will call WMPMSCompositor::SetVideoFrameProviderClient,
+  //    which in turn will trigger cc::VideoFrameProviderClient::StartRendering.
+  // 5. Then cc::VideoFrameProviderClient will start calling
+  //    WMPMSCompositor::UpdateCurrentFrame, GetCurrentFrame for rendering
+  //    repeatedly.
+  // 6. When WMPSMS::pause gets called, it should trigger
+  //    content::VideoFrameProvider::Pause, and then the provider will stop
+  //    pushing frames into WMPMS, but instead digesting them; simultanously, it
+  //    should call cc::VideoFrameProviderClient::StopRendering, so the client
+  //    will stop asking frames from WMPMSCompositor.
+  // 7. When WMPMS::play gets called, evething paused in step 6 should be
+  //    resumed.
+  MockVideoFrameProvider* provider = LoadAndGetFrameProvider(true);
+
+  provider->QueueFrames(
+      "0 33 66 100 133 166 200 233 266 300 333 366 400 433 "
+      "466 500 533 566 600");
+
+  EXPECT_CALL(mock_cb_, StartRendering());
+  EXPECT_CALL(mock_cb_,
+              ReadyStateChanged(blink::WebMediaPlayer::ReadyStateHaveMetadata));
+  EXPECT_CALL(mock_cb_, ReadyStateChanged(
+                            blink::WebMediaPlayer::ReadyStateHaveEnoughData));
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+}
+
+TEST_F(WebMediaPlayerMSTest, Playing_ErrorFrame) {
+  MockVideoFrameProvider* provider = LoadAndGetFrameProvider(false);
+
+  provider->QueueFrames(
+      "0 33 66 100 133 166 200 233 266 300 333 366 400 433 "
+      "466 500 533 566 600 error");
+
+  EXPECT_CALL(mock_cb_, StartRendering());
+  EXPECT_CALL(mock_cb_,
+              ReadyStateChanged(blink::WebMediaPlayer::ReadyStateHaveMetadata));
+  EXPECT_CALL(mock_cb_, ReadyStateChanged(
+                            blink::WebMediaPlayer::ReadyStateHaveEnoughData));
+  EXPECT_CALL(mock_cb_, NetworkStateChanged(
+                            blink::WebMediaPlayer::NetworkStateFormatError));
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_ERROR_NETWORK);
+}
+
+TEST_F(WebMediaPlayerMSTest, PlayThenPause) {
+  MockVideoFrameProvider* provider = LoadAndGetFrameProvider(false);
+
+  provider->QueueFrames(
+      "0 33 66 100 133 brake 166 200 233 266 300 333 366 400 "
+      "433 466 500 533 566 600");
+
+  EXPECT_CALL(mock_cb_, StartRendering());
+  EXPECT_CALL(mock_cb_,
+              ReadyStateChanged(blink::WebMediaPlayer::ReadyStateHaveMetadata));
+  EXPECT_CALL(mock_cb_, ReadyStateChanged(
+                            blink::WebMediaPlayer::ReadyStateHaveEnoughData));
+  // Rendering will be "paused" at the TestBrake.
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  mock_cb_.VerifyAndClearExpectations();
+
+  // Here No more rendering. 1. Render should not be called, 2. Frame freeze.
+  EXPECT_CALL(mock_cb_, StopRendering());
+  player_.pause();
+  cc::VideoFrameProvider* compositor = GetCompositorForTest();
+  auto prev_frame = compositor->GetCurrentFrame();
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  auto after_frame = compositor->GetCurrentFrame();
+  EXPECT_EQ(prev_frame->timestamp(), after_frame->timestamp());
+}
+
+TEST_F(WebMediaPlayerMSTest, PlayThenPauseThenPlay) {
+  MockVideoFrameProvider* provider = LoadAndGetFrameProvider(false);
+
+  provider->QueueFrames(
+      "0 33 66 100 133 brake 166 200 233 266 300 333 366 400 "
+      "433 brake 466 500 533 566 600");
+
+  EXPECT_CALL(mock_cb_, StartRendering());
+  EXPECT_CALL(mock_cb_,
+              ReadyStateChanged(blink::WebMediaPlayer::ReadyStateHaveMetadata));
+  EXPECT_CALL(mock_cb_, ReadyStateChanged(
+                            blink::WebMediaPlayer::ReadyStateHaveEnoughData));
+  // Rendering will be "paused" at the TestBrake.
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  mock_cb_.VerifyAndClearExpectations();
+
+  // Here No more rendering. 1. Render should not be called, 2. Frame freeze.
+  EXPECT_CALL(mock_cb_, StopRendering());
+  player_.pause();
+  cc::VideoFrameProvider* compositor = GetCompositorForTest();
+  auto prev_frame = compositor->GetCurrentFrame();
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  auto after_frame = compositor->GetCurrentFrame();
+  EXPECT_EQ(prev_frame->timestamp(), after_frame->timestamp());
+  mock_cb_.VerifyAndClearExpectations();
+
+  // We resume the player
+  EXPECT_CALL(mock_cb_, StartRendering());
+  player_.play();
+  prev_frame = compositor->GetCurrentFrame();
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  after_frame = compositor->GetCurrentFrame();
+  EXPECT_NE(prev_frame->timestamp(), after_frame->timestamp());
+}
+
+TEST_F(WebMediaPlayerMSTest, BackgroudRendering) {
+  MockVideoFrameProvider* provider = LoadAndGetFrameProvider(true);
+
+  provider->QueueFrames(
+      "0 33 66 100 133 brake 166 200 233 266 300 333 366 400 "
+      "433 brake 466 500 533 566 600");
+
+  EXPECT_CALL(mock_cb_, StartRendering());
+  EXPECT_CALL(mock_cb_,
+              ReadyStateChanged(blink::WebMediaPlayer::ReadyStateHaveMetadata));
+  EXPECT_CALL(mock_cb_, ReadyStateChanged(
+                            blink::WebMediaPlayer::ReadyStateHaveEnoughData));
+  // Rendering will be "paused" at the TestBrake.
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  mock_cb_.VerifyAndClearExpectations();
+
+  // Switch to background rendering, expect rendering to continue
+  MockVideoFrameProviderClient* client = client_.GetVideoFrameProviderClient();
+  client->SetBackgroundRendering(true);
+  cc::VideoFrameProvider* compositor = GetCompositorForTest();
+  auto prev_frame = compositor->GetCurrentFrame();
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  auto after_frame = compositor->GetCurrentFrame();
+  EXPECT_NE(prev_frame->timestamp(), after_frame->timestamp());
+
+  // Switch to foreground rendering
+  client->SetBackgroundRendering(false);
+  prev_frame = compositor->GetCurrentFrame();
+  message_loop_controller_.RunAndWaitForStatus(
+      media::PipelineStatus::PIPELINE_OK);
+  after_frame = compositor->GetCurrentFrame();
+  EXPECT_NE(prev_frame->timestamp(), after_frame->timestamp());
+}
+}  // namespace content