diff --git a/library/core/src/test/java/com/google/android/exoplayer2/e2etest/MkvPlaybackTest.java b/library/core/src/test/java/com/google/android/exoplayer2/e2etest/MkvPlaybackTest.java
index 398d6c05d4..b5d242f52e 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/e2etest/MkvPlaybackTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/e2etest/MkvPlaybackTest.java
@@ -19,6 +19,7 @@ import android.content.Context;
 import android.graphics.SurfaceTexture;
 import android.view.Surface;
 import androidx.test.core.app.ApplicationProvider;
+import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.Player;
@@ -29,6 +30,7 @@ import com.google.android.exoplayer2.robolectric.TestPlayerRunHelper;
 import com.google.android.exoplayer2.testutil.CapturingRenderersFactory;
 import com.google.android.exoplayer2.testutil.DumpFileAsserts;
 import com.google.android.exoplayer2.testutil.FakeClock;
+import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
 import com.google.common.collect.ImmutableList;
 import org.junit.Rule;
 import org.junit.Test;
@@ -65,6 +67,19 @@ public final class MkvPlaybackTest {
         new ExoPlayer.Builder(applicationContext, capturingRenderersFactory)
             .setClock(new FakeClock(/* isAutoAdvancing= */ true))
             .build();
+    // TODO(internal b/174661563): Remove the for-loop below to enable the text renderer when
+    //  subtitle output is not flaky.
+    for (int textRendererIndex = 0;
+        textRendererIndex < player.getRendererCount();
+        textRendererIndex++) {
+      if (player.getRendererType(textRendererIndex) == C.TRACK_TYPE_TEXT) {
+        player.setTrackSelectionParameters(
+            new DefaultTrackSelector.ParametersBuilder(applicationContext)
+                .setRendererDisabled(textRendererIndex, /* disabled= */ true)
+                .build());
+        break;
+      }
+    }
     player.setVideoSurface(new Surface(new SurfaceTexture(/* texName= */ 1)));
     PlaybackOutput playbackOutput = PlaybackOutput.register(player, capturingRenderersFactory);
 
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/e2etest/WebvttPlaybackTest.java b/library/core/src/test/java/com/google/android/exoplayer2/e2etest/WebvttPlaybackTest.java
new file mode 100644
index 0000000000..49b29f3c5c
--- /dev/null
+++ b/library/core/src/test/java/com/google/android/exoplayer2/e2etest/WebvttPlaybackTest.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2021 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.google.android.exoplayer2.e2etest;
+
+import android.content.Context;
+import android.graphics.SurfaceTexture;
+import android.net.Uri;
+import android.view.Surface;
+import androidx.test.core.app.ApplicationProvider;
+import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.ExoPlayer;
+import com.google.android.exoplayer2.MediaItem;
+import com.google.android.exoplayer2.Player;
+import com.google.android.exoplayer2.robolectric.PlaybackOutput;
+import com.google.android.exoplayer2.robolectric.ShadowMediaCodecConfig;
+import com.google.android.exoplayer2.robolectric.TestPlayerRunHelper;
+import com.google.android.exoplayer2.source.DefaultMediaSourceFactory;
+import com.google.android.exoplayer2.source.MediaSourceFactory;
+import com.google.android.exoplayer2.testutil.CapturingRenderersFactory;
+import com.google.android.exoplayer2.testutil.DumpFileAsserts;
+import com.google.android.exoplayer2.testutil.FakeClock;
+import com.google.android.exoplayer2.util.MimeTypes;
+import com.google.common.collect.ImmutableList;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.ParameterizedRobolectricTestRunner;
+
+/** End-to-end tests using side-loaded WebVTT subtitles. */
+@RunWith(ParameterizedRobolectricTestRunner.class)
+public class WebvttPlaybackTest {
+  @ParameterizedRobolectricTestRunner.Parameters(name = "{0}")
+  public static ImmutableList<String> mediaSamples() {
+    return ImmutableList.of("typical");
+  }
+
+  @ParameterizedRobolectricTestRunner.Parameter public String inputFile;
+
+  @Rule
+  public ShadowMediaCodecConfig mediaCodecConfig =
+      ShadowMediaCodecConfig.forAllSupportedMimeTypes();
+
+  @Test
+  public void test() throws Exception {
+    Context applicationContext = ApplicationProvider.getApplicationContext();
+    CapturingRenderersFactory capturingRenderersFactory =
+        new CapturingRenderersFactory(applicationContext);
+    MediaSourceFactory mediaSourceFactory =
+        new DefaultMediaSourceFactory(applicationContext)
+            .experimentalUseProgressiveMediaSourceForSubtitles(true);
+    ExoPlayer player =
+        new ExoPlayer.Builder(applicationContext, capturingRenderersFactory)
+            .setClock(new FakeClock(/* isAutoAdvancing= */ true))
+            .setMediaSourceFactory(mediaSourceFactory)
+            .build();
+    player.setVideoSurface(new Surface(new SurfaceTexture(/* texName= */ 1)));
+    PlaybackOutput playbackOutput = PlaybackOutput.register(player, capturingRenderersFactory);
+    MediaItem mediaItem =
+        new MediaItem.Builder()
+            .setUri("asset:///media/mp4/preroll-5s.mp4")
+            .setSubtitleConfigurations(
+                ImmutableList.of(
+                    new MediaItem.SubtitleConfiguration.Builder(
+                            Uri.parse("asset:///media/webvtt/" + inputFile))
+                        .setMimeType(MimeTypes.TEXT_VTT)
+                        .setLanguage("en")
+                        .setSelectionFlags(C.SELECTION_FLAG_DEFAULT)
+                        .build()))
+            .build();
+
+    player.setMediaItem(mediaItem);
+    player.prepare();
+    player.play();
+    TestPlayerRunHelper.runUntilPlaybackState(player, Player.STATE_ENDED);
+    player.release();
+
+    DumpFileAsserts.assertOutput(
+        applicationContext, playbackOutput, "playbackdumps/webvtt/" + inputFile + ".dump");
+  }
+}
diff --git a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/e2etest/DashPlaybackTest.java b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/e2etest/DashPlaybackTest.java
index 053fd707e4..a6f7cf5aec 100644
--- a/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/e2etest/DashPlaybackTest.java
+++ b/library/dash/src/test/java/com/google/android/exoplayer2/source/dash/e2etest/DashPlaybackTest.java
@@ -33,6 +33,7 @@ import com.google.android.exoplayer2.testutil.CapturingRenderersFactory;
 import com.google.android.exoplayer2.testutil.DumpFileAsserts;
 import com.google.android.exoplayer2.testutil.FakeClock;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
+import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -47,6 +48,8 @@ public final class DashPlaybackTest {
 
   // https://github.com/google/ExoPlayer/issues/7985
   @Test
+  @Ignore(
+      "Disabled until subtitles are reliably asserted in robolectric tests [internal b/174661563].")
   public void webvttInMp4() throws Exception {
     Context applicationContext = ApplicationProvider.getApplicationContext();
     CapturingRenderersFactory capturingRenderersFactory =
diff --git a/robolectricutils/src/main/java/com/google/android/exoplayer2/robolectric/PlaybackOutput.java b/robolectricutils/src/main/java/com/google/android/exoplayer2/robolectric/PlaybackOutput.java
index 3f9718fc98..000f9e627e 100644
--- a/robolectricutils/src/main/java/com/google/android/exoplayer2/robolectric/PlaybackOutput.java
+++ b/robolectricutils/src/main/java/com/google/android/exoplayer2/robolectric/PlaybackOutput.java
@@ -17,8 +17,8 @@ package com.google.android.exoplayer2.robolectric;
 
 import android.graphics.Bitmap;
 import androidx.annotation.Nullable;
+import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.Player;
-import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.dvbsi.AppInfoTable;
 import com.google.android.exoplayer2.metadata.emsg.EventMessage;
@@ -55,8 +55,7 @@ public final class PlaybackOutput implements Dumper.Dumpable {
   private final List<Metadata> metadatas;
   private final List<List<Cue>> subtitles;
 
-  private PlaybackOutput(
-      SimpleExoPlayer player, CapturingRenderersFactory capturingRenderersFactory) {
+  private PlaybackOutput(ExoPlayer player, CapturingRenderersFactory capturingRenderersFactory) {
     this.capturingRenderersFactory = capturingRenderersFactory;
 
     metadatas = Collections.synchronizedList(new ArrayList<>());
@@ -73,7 +72,7 @@ public final class PlaybackOutput implements Dumper.Dumpable {
 
           @Override
           public void onCues(List<Cue> cues) {
-            // TODO(internal b/174661563): Output subtitle data when it's not flaky.
+            subtitles.add(cues);
           }
         });
   }
@@ -85,13 +84,13 @@ public final class PlaybackOutput implements Dumper.Dumpable {
    * <p>Must be called <b>before</b> playback to ensure metadata and text output is captured
    * correctly.
    *
-   * @param player The {@link SimpleExoPlayer} to capture metadata and text output from.
+   * @param player The {@link ExoPlayer} to capture metadata and text output from.
    * @param capturingRenderersFactory The {@link CapturingRenderersFactory} to capture audio and
    *     video output from.
    * @return A new instance that can be used to dump the playback output.
    */
   public static PlaybackOutput register(
-      SimpleExoPlayer player, CapturingRenderersFactory capturingRenderersFactory) {
+      ExoPlayer player, CapturingRenderersFactory capturingRenderersFactory) {
     return new PlaybackOutput(player, capturingRenderersFactory);
   }
 
diff --git a/testdata/src/test/assets/playbackdumps/webvtt/typical.dump b/testdata/src/test/assets/playbackdumps/webvtt/typical.dump
new file mode 100644
index 0000000000..db4b4047c5
--- /dev/null
+++ b/testdata/src/test/assets/playbackdumps/webvtt/typical.dump
@@ -0,0 +1,375 @@
+MediaCodecAdapter (exotest.audio.aac):
+  buffers.length = 218
+  buffers[0] = length 21, hash D57A2CCC
+  buffers[1] = length 4, hash EE9DF
+  buffers[2] = length 4, hash EE9DF
+  buffers[3] = length 4, hash EE9DF
+  buffers[4] = length 4, hash EE9DF
+  buffers[5] = length 4, hash EE9DF
+  buffers[6] = length 4, hash EE9DF
+  buffers[7] = length 4, hash EE9DF
+  buffers[8] = length 4, hash EE9DF
+  buffers[9] = length 4, hash EE9DF
+  buffers[10] = length 4, hash EE9DF
+  buffers[11] = length 4, hash EE9DF
+  buffers[12] = length 4, hash EE9DF
+  buffers[13] = length 4, hash EE9DF
+  buffers[14] = length 4, hash EE9DF
+  buffers[15] = length 4, hash EE9DF
+  buffers[16] = length 4, hash EE9DF
+  buffers[17] = length 4, hash EE9DF
+  buffers[18] = length 4, hash EE9DF
+  buffers[19] = length 4, hash EE9DF
+  buffers[20] = length 4, hash EE9DF
+  buffers[21] = length 4, hash EE9DF
+  buffers[22] = length 4, hash EE9DF
+  buffers[23] = length 4, hash EE9DF
+  buffers[24] = length 4, hash EE9DF
+  buffers[25] = length 4, hash EE9DF
+  buffers[26] = length 4, hash EE9DF
+  buffers[27] = length 4, hash EE9DF
+  buffers[28] = length 4, hash EE9DF
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+  buffers[30] = length 4, hash EE9DF
+  buffers[31] = length 4, hash EE9DF
+  buffers[32] = length 4, hash EE9DF
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+  buffers[35] = length 4, hash EE9DF
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+  buffers[44] = length 4, hash EE9DF
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+  buffers[51] = length 4, hash EE9DF
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+  buffers[217] = length 0, hash 1
+MediaCodecAdapter (exotest.video.avc):
+  buffers.length = 126
+  buffers[0] = length 5245, hash C090A41E
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+  buffers[44] = length 18, hash 1B081BD1
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+  buffers[46] = length 22, hash 6D292D94
+  buffers[47] = length 18, hash D646C05A
+  buffers[48] = length 18, hash 14BB0F8E
+  buffers[49] = length 28, hash 5DE2C2B
+  buffers[50] = length 22, hash 57E81CD0
+  buffers[51] = length 18, hash E176AD96
+  buffers[52] = length 18, hash 1FEAFCCA
+  buffers[53] = length 28, hash C163BE68
+  buffers[54] = length 22, hash B0C92D0B
+  buffers[55] = length 18, hash 3B013BD2
+  buffers[56] = length 18, hash 79758B06
+  buffers[57] = length 28, hash F72EB1A3
+  buffers[58] = length 22, hash 9B881C48
+  buffers[59] = length 18, hash 4631290E
+  buffers[60] = length 18, hash 84A57842
+  buffers[61] = length 28, hash E1FCF000
+  buffers[62] = length 22, hash 359D2D82
+  buffers[63] = length 18, hash 62DE0FC9
+  buffers[64] = length 18, hash A1525EFD
+  buffers[65] = length 28, hash 5350E8FA
+  buffers[66] = length 22, hash EE2060DF
+  buffers[67] = length 18, hash 77D95125
+  buffers[68] = length 18, hash B64DA059
+  buffers[69] = length 28, hash ED67B37
+  buffers[70] = length 22, hash 4701711B
+  buffers[71] = length 18, hash D163DF61
+  buffers[72] = length 18, hash FD82E95
+  buffers[73] = length 28, hash 44A16E72
+  buffers[74] = length 22, hash 31C06057
+  buffers[75] = length 18, hash DC93CC9D
+  buffers[76] = length 18, hash 1B081BD1
+  buffers[77] = length 28, hash 2700AF
+  buffers[78] = length 22, hash 6D292D94
+  buffers[79] = length 18, hash D646C05A
+  buffers[80] = length 18, hash 14BB0F8E
+  buffers[81] = length 28, hash 5DE2C2B
+  buffers[82] = length 22, hash 57E81CD0
+  buffers[83] = length 18, hash E176AD96
+  buffers[84] = length 18, hash 1FEAFCCA
+  buffers[85] = length 28, hash C163BE68
+  buffers[86] = length 22, hash B0C92D0B
+  buffers[87] = length 18, hash 3B013BD2
+  buffers[88] = length 18, hash 79758B06
+  buffers[89] = length 28, hash F72EB1A3
+  buffers[90] = length 22, hash 9B881C48
+  buffers[91] = length 18, hash 4631290E
+  buffers[92] = length 18, hash 84A57842
+  buffers[93] = length 33, hash AF5CF49E
+  buffers[94] = length 22, hash 359D2D82
+  buffers[95] = length 18, hash 62DE0FC9
+  buffers[96] = length 18, hash A1525EFD
+  buffers[97] = length 33, hash F4C6DE46
+  buffers[98] = length 22, hash EE2060DF
+  buffers[99] = length 18, hash 77D95125
+  buffers[100] = length 18, hash B64DA059
+  buffers[101] = length 28, hash ED67B37
+  buffers[102] = length 22, hash 4701711B
+  buffers[103] = length 18, hash D163DF61
+  buffers[104] = length 18, hash FD82E95
+  buffers[105] = length 28, hash 44A16E72
+  buffers[106] = length 22, hash 31C06057
+  buffers[107] = length 18, hash DC93CC9D
+  buffers[108] = length 18, hash 1B081BD1
+  buffers[109] = length 28, hash 2700AF
+  buffers[110] = length 22, hash 6D292D94
+  buffers[111] = length 18, hash D646C05A
+  buffers[112] = length 18, hash 14BB0F8E
+  buffers[113] = length 27, hash 5292D9E
+  buffers[114] = length 22, hash 57E81CD0
+  buffers[115] = length 18, hash E176AD96
+  buffers[116] = length 18, hash 1FEAFCCA
+  buffers[117] = length 26, hash B0CAA4C9
+  buffers[118] = length 22, hash B0C92D0B
+  buffers[119] = length 18, hash 3B013BD2
+  buffers[120] = length 18, hash 79758B06
+  buffers[121] = length 26, hash C63A1445
+  buffers[122] = length 22, hash 9B881C48
+  buffers[123] = length 18, hash 4631290E
+  buffers[124] = length 18, hash 84A57842
+  buffers[125] = length 0, hash 1
+TextOutput:
+  Subtitle[0]:
+    Cues = []
+  Subtitle[1]:
+    Cue[0]:
+      text = This is the first subtitle.
+      textAlignment = ALIGN_CENTER
+      line = -1.0
+      lineType = 1
+      lineAnchor = 0
+      position = 0.5
+      positionAnchor = 1
+      size = 1.0
+  Subtitle[2]:
+    Cues = []
+  Subtitle[3]:
+    Cue[0]:
+      text = This is the second subtitle.
+      textAlignment = ALIGN_CENTER
+      line = -1.0
+      lineType = 1
+      lineAnchor = 0
+      position = 0.5
+      positionAnchor = 1
+      size = 1.0
+  Subtitle[4]:
+    Cues = []