Rename and add test cases for video player in accessibility.

Bug: 168567356
Test: make RunSettingsRoboTests ROBOTEST_FILTER=VideoPlayerTest

Change-Id: I2ea415b06d2870f55650290f48dd9b2998ef608d

tests/robotests/src/com/android/settings/accessibility/VideoPlayerTest.java

@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.accessibility;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.media.MediaPlayer;
+import android.view.Surface;
+import android.view.TextureView;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.accessibility.VideoPlayer.State;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link VideoPlayer}. */
+@RunWith(RobolectricTestRunner.class)
+public class VideoPlayerTest {
+
+    @Mock
+    private MediaPlayer mMediaPlayer;
+
+    @Mock
+    private TextureView mTextureView;
+
+    @Mock
+    private Surface mSurface;
+
+    private VideoPlayer mVideoPlayer;
+
+    @Before
+    public void initVideoPlayer() {
+        MockitoAnnotations.initMocks(this);
+
+        final int videoRes = 0;
+        final Context context = ApplicationProvider.getApplicationContext();
+
+        mVideoPlayer = spy(VideoPlayer.create(context, videoRes, mTextureView));
+        mVideoPlayer.mMediaPlayer = mMediaPlayer;
+        mVideoPlayer.mAnimationSurface = mSurface;
+    }
+
+    @Test
+    public void setSurfaceTextureListener_success() {
+        verify(mTextureView).setSurfaceTextureListener(any());
+    }
+
+    @Test
+    public void onPlayerPaused_startedState_pause() {
+        mVideoPlayer.mMediaPlayerState = State.STARTED;
+
+        mVideoPlayer.pause();
+
+        assertThat(mVideoPlayer.mMediaPlayerState).isEqualTo(State.PAUSED);
+        verify(mMediaPlayer).pause();
+    }
+
+    @Test
+    public void onPlayerResumed_pausedState_start() {
+        mVideoPlayer.mMediaPlayerState = State.PAUSED;
+
+        mVideoPlayer.resume();
+
+        assertThat(mVideoPlayer.mMediaPlayerState).isEqualTo(State.STARTED);
+        verify(mMediaPlayer).start();
+    }
+
+    @Test
+    public void onPlayerReleased_stoppedState_release() {
+        mVideoPlayer.mMediaPlayerState = State.STOPPED;
+
+        mVideoPlayer.release();
+
+        assertThat(mVideoPlayer.mMediaPlayerState).isEqualTo(State.END);
+        verify(mMediaPlayer).release();
+        verify(mSurface).release();
+    }
+
+    @Test
+    public void onSurfaceTextureDestroyed_preparedState_release() {
+        mVideoPlayer.mMediaPlayerState = State.PREPARED;
+
+        mVideoPlayer.onSurfaceTextureDestroyed(any());
+
+        assertThat(mVideoPlayer.mMediaPlayerState).isEqualTo(State.END);
+        verify(mMediaPlayer).release();
+        verify(mSurface).release();
+    }
+}