Implement MediaSession on top of the WebMediaPlayerDelegate.

content/browser/media/android/media_session_controller_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/tuple.h"
+#include "content/browser/media/android/media_session.h"
+#include "content/browser/media/android/media_session_controller.h"
+#include "content/browser/media/android/media_web_contents_observer_android.h"
+#include "content/common/frame_messages.h"
+#include "content/test/test_render_view_host.h"
+#include "content/test/test_web_contents.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+class MediaSessionControllerTest : public RenderViewHostImplTestHarness {
+ public:
+  void SetUp() override {
+    RenderViewHostImplTestHarness::SetUp();
+    id_ = WebContentsObserver::MediaPlayerId(contents()->GetMainFrame(), 0);
+    observer_ = MediaWebContentsObserverAndroid::FromWebContents(contents());
+    controller_ = CreateController();
+  }
+
+  void TearDown() override {
+    // Destruct the controller prior to any other teardown to avoid out of order
+    // destruction relative to the MediaSession instance.
+    controller_.reset();
+    RenderViewHostImplTestHarness::TearDown();
+  }
+
+ protected:
+  scoped_ptr<MediaSessionController> CreateController() {
+    return scoped_ptr<MediaSessionController>(
+        new MediaSessionController(id_, observer_));
+  }
+
+  MediaSession* media_session() { return MediaSession::Get(contents()); }
+
+  IPC::TestSink& test_sink() { return main_test_rfh()->GetProcess()->sink(); }
+
+  void Suspend() {
+    controller_->OnSuspend(controller_->get_player_id_for_testing());
+  }
+
+  void Resume() {
+    controller_->OnResume(controller_->get_player_id_for_testing());
+  }
+
+  void SetVolumeMultiplier(double multiplier) {
+    controller_->OnSetVolumeMultiplier(controller_->get_player_id_for_testing(),
+                                       multiplier);
+  }
+
+  // Returns a duration long enough for a media session instance to be created.
+  base::TimeDelta DurationJustRight() {
+    return base::TimeDelta::FromSeconds(
+        MediaSessionController::kMinimumDurationForContentSecs + 1);
+  }
+
+  // Returns a duration too short for a media session instance.
+  base::TimeDelta DurationTooShort() {
+    return base::TimeDelta::FromSeconds(
+        MediaSessionController::kMinimumDurationForContentSecs);
+  }
+
+  template <typename T>
+  bool VerifyMessagePlayPause() {

[mlamouri (slow - plz ping), 2016/01/22 16:58:31]

nit: really a naming issue here. "Verify" sounds like the EXPECT_* is run in
there but it's actually not. Maybe you should rename
"ReceivedMessagePlayPaus()"?

[DaleCurtis, 2016/01/23 02:11:00]

Done.

+    const IPC::Message* msg = test_sink().GetUniqueMessageMatching(T::ID);
+    if (!msg)
+      return false;
+
+    base::Tuple<int64_t> result;
+    if (!T::Read(msg, &result))
+      return false;
+
+    EXPECT_EQ(id_.second, base::get<0>(result));
+    test_sink().ClearMessages();
+    return id_.second == base::get<0>(result);
+  }
+
+  template <typename T>
+  bool VerifyMessageVolumeMultiplierUpdate(double expected_multiplier) {

[mlamouri (slow - plz ping), 2016/01/22 16:58:31]

ditto

[DaleCurtis, 2016/01/23 02:11:00]

Done.

+    const IPC::Message* msg = test_sink().GetUniqueMessageMatching(T::ID);
+    if (!msg)
+      return false;
+
+    base::Tuple<int64_t, double> result;
+    if (!T::Read(msg, &result))
+      return false;
+
+    EXPECT_EQ(id_.second, base::get<0>(result));
+    if (id_.second != base::get<0>(result))
+      return false;
+
+    EXPECT_EQ(expected_multiplier, base::get<1>(result));
+    test_sink().ClearMessages();
+    return expected_multiplier == base::get<1>(result);
+  }
+
+  WebContentsObserver::MediaPlayerId id_;
+  MediaWebContentsObserverAndroid* observer_;
+  scoped_ptr<MediaSessionController> controller_;
+};
+
+TEST_F(MediaSessionControllerTest, NoAudioNoSession) {
+  ASSERT_TRUE(controller_->Initialize(false, false, DurationJustRight()));
+  EXPECT_TRUE(media_session()->IsSuspended());
+  EXPECT_FALSE(media_session()->IsControllable());
+}
+
+TEST_F(MediaSessionControllerTest, IsRemoteNoSession) {
+  ASSERT_TRUE(controller_->Initialize(true, true, DurationJustRight()));
+  EXPECT_TRUE(media_session()->IsSuspended());
+  EXPECT_FALSE(media_session()->IsControllable());
+}
+
+TEST_F(MediaSessionControllerTest, TooShortNoControllableSession) {
+  ASSERT_TRUE(controller_->Initialize(true, false, DurationTooShort()));
+  EXPECT_FALSE(media_session()->IsSuspended());
+  EXPECT_FALSE(media_session()->IsControllable());
+}
+
+TEST_F(MediaSessionControllerTest, BasicControls) {
+  ASSERT_TRUE(controller_->Initialize(true, false, DurationJustRight()));
+  EXPECT_FALSE(media_session()->IsSuspended());
+  EXPECT_TRUE(media_session()->IsControllable());
+
+  // Verify suspend notifies the renderer and maintains its session.
+  Suspend();
+  ASSERT_TRUE(VerifyMessagePlayPause<FrameMsg_MediaDelegatePause>());

[mlamouri (slow - plz ping), 2016/01/22 16:58:31]

nit: why ASSERT_TRUE?

[DaleCurtis, 2016/01/23 02:11:00]

Done.

+
+  // Likewise verify the resume behavior.
+  Resume();
+  ASSERT_TRUE(VerifyMessagePlayPause<FrameMsg_MediaDelegatePlay>());

[mlamouri (slow - plz ping), 2016/01/22 16:58:31]

ditto

[DaleCurtis, 2016/01/23 02:11:00]

Done.

+
+  // Verify destruction of the controller removes its session.
+  controller_.reset();
+  EXPECT_TRUE(media_session()->IsSuspended());
+  EXPECT_FALSE(media_session()->IsControllable());
+}
+
+TEST_F(MediaSessionControllerTest, VolumeMultiplier) {
+  ASSERT_TRUE(controller_->Initialize(true, false, DurationJustRight()));
+  EXPECT_FALSE(media_session()->IsSuspended());
+  EXPECT_TRUE(media_session()->IsControllable());
+
+  // Upon creation of the MediaSession the default multiplier will be sent.
+  ASSERT_TRUE(VerifyMessageVolumeMultiplierUpdate<
+              FrameMsg_MediaDelegateVolumeMultiplierUpdate>(1.0));
+
+  // Verify a different volume multiplier is sent.
+  const double kTestMultiplier = 0.5;
+  SetVolumeMultiplier(kTestMultiplier);
+  ASSERT_TRUE(VerifyMessageVolumeMultiplierUpdate<
+              FrameMsg_MediaDelegateVolumeMultiplierUpdate>(kTestMultiplier));
+}
+
+TEST_F(MediaSessionControllerTest, ControllerSidePause) {
+  ASSERT_TRUE(controller_->Initialize(true, false, DurationJustRight()));
+  EXPECT_FALSE(media_session()->IsSuspended());
+  EXPECT_TRUE(media_session()->IsControllable());
+
+  // Verify pause behavior.
+  controller_->PausePlayback();
+  EXPECT_TRUE(media_session()->IsSuspended());
+  EXPECT_TRUE(media_session()->IsControllable());
+}
+
+}  // namespace content