diff --git a/library/src/androidTest/java/com/google/android/exoplayer/extractor/ogg/OggExtractorFileTests.java b/library/src/androidTest/java/com/google/android/exoplayer/extractor/ogg/OggExtractorFileTests.java
index 1b7f6e12e9..4234dd03bc 100644
--- a/library/src/androidTest/java/com/google/android/exoplayer/extractor/ogg/OggExtractorFileTests.java
+++ b/library/src/androidTest/java/com/google/android/exoplayer/extractor/ogg/OggExtractorFileTests.java
@@ -15,9 +15,6 @@
  */
 package com.google.android.exoplayer.extractor.ogg;
 
-import com.google.android.exoplayer.testutil.FakeExtractorInput;
-import com.google.android.exoplayer.testutil.FakeExtractorOutput;
-import com.google.android.exoplayer.testutil.FakeTrackOutput;
 import com.google.android.exoplayer.testutil.TestUtil;
 
 import android.test.InstrumentationTestCase;
@@ -27,69 +24,21 @@ import android.test.InstrumentationTestCase;
  */
 public final class OggExtractorFileTests extends InstrumentationTestCase {
 
-  private static final String OPUS_TEST_FILE = "ogg/bear.opus";
-  private static final String FLAC_TEST_FILE = "ogg/bear_flac.ogg";
-  private static final String FLAC_NS_TEST_FILE = "ogg/bear_flac_noseektable.ogg";
-  private static final String VORBIS_TEST_FILE = "ogg/bear_vorbis.ogg";
-  private static final String DUMP_EXTENSION = ".dump";
-  private static final String UNKNOWN_LENGTH_EXTENSION = ".unklen";
-
   public void testOpus() throws Exception {
-    parseFile(OPUS_TEST_FILE);
+    TestUtil.assertOutput(new OggExtractor(), "ogg/bear.opus", getInstrumentation());
   }
 
   public void testFlac() throws Exception {
-    for (int i = 0; i < 8; i++) {
-      testFlac((i & 1) != 0, (i & 2) != 0, (i & 4) != 0);
-    }
-  }
-
-  private void testFlac(boolean simulateIOErrors, boolean simulateUnknownLength,
-      boolean simulatePartialReads) throws Exception {
-    FakeExtractorOutput extractorOutput = parseFile(FLAC_TEST_FILE, simulateIOErrors,
-        simulateUnknownLength, simulatePartialReads);
-    FakeTrackOutput trackOutput = extractorOutput.trackOutputs.get(0);
-    for (int i = 0; i < 33; i++) {
-      byte[] sampleData = trackOutput.getSampleData(i);
-      assertTrue(FlacReader.isAudioPacket(sampleData));
-    }
+    TestUtil.assertOutput(new OggExtractor(), "ogg/bear_flac.ogg", getInstrumentation());
   }
 
   public void testFlacNoSeektable() throws Exception {
-    parseFile(FLAC_NS_TEST_FILE);
+    TestUtil.assertOutput(new OggExtractor(), "ogg/bear_flac_noseektable.ogg",
+        getInstrumentation());
   }
 
   public void testVorbis() throws Exception {
-    parseFile(VORBIS_TEST_FILE);
-  }
-
-  private void parseFile(String testFile) throws Exception {
-    for (int i = 0; i < 8; i++) {
-      parseFile(testFile, (i & 1) != 0, (i & 2) != 0, (i & 4) != 0);
-    }
-  }
-
-  private FakeExtractorOutput parseFile(String testFile, boolean simulateIOErrors,
-      boolean simulateUnknownLength, boolean simulatePartialReads) throws Exception {
-    byte[] fileData = TestUtil.getByteArray(getInstrumentation(), testFile);
-    FakeExtractorInput input = new FakeExtractorInput.Builder().setData(fileData)
-        .setSimulateIOErrors(simulateIOErrors)
-        .setSimulateUnknownLength(simulateUnknownLength)
-        .setSimulatePartialReads(simulatePartialReads).build();
-
-    OggExtractor extractor = new OggExtractor();
-    assertTrue(TestUtil.sniffTestData(extractor, input));
-    input.resetPeekPosition();
-    FakeExtractorOutput extractorOutput = TestUtil.consumeTestData(extractor, input, true);
-
-    String dumpFile = testFile;
-    if (simulateUnknownLength) {
-      dumpFile += UNKNOWN_LENGTH_EXTENSION;
-    }
-    dumpFile += DUMP_EXTENSION;
-    extractorOutput.assertOutput(getInstrumentation(), dumpFile);
-
-    return extractorOutput;
+    TestUtil.assertOutput(new OggExtractor(), "ogg/bear_vorbis.ogg", getInstrumentation());
   }
 
 }
diff --git a/library/src/androidTest/java/com/google/android/exoplayer/testutil/TestUtil.java b/library/src/androidTest/java/com/google/android/exoplayer/testutil/TestUtil.java
index c645f494eb..0f73e7e94e 100644
--- a/library/src/androidTest/java/com/google/android/exoplayer/testutil/TestUtil.java
+++ b/library/src/androidTest/java/com/google/android/exoplayer/testutil/TestUtil.java
@@ -24,6 +24,7 @@ import com.google.android.exoplayer.util.Util;
 
 import android.app.Instrumentation;
 import android.test.InstrumentationTestCase;
+import junit.framework.Assert;
 import org.mockito.MockitoAnnotations;
 
 import java.io.IOException;
@@ -35,6 +36,9 @@ import java.util.Random;
  */
 public class TestUtil {
 
+  private static final String DUMP_EXTENSION = ".dump";
+  private static final String UNKNOWN_LENGTH_EXTENSION = ".unklen";
+
   private TestUtil() {}
 
   public static boolean sniffTestData(Extractor extractor, byte[] data)
@@ -162,4 +166,66 @@ public class TestUtil {
     return new FakeExtractorInput.Builder().setData(data).build();
   }
 
+  /**
+   * Calls {@link #assertOutput(Extractor, String, Instrumentation, boolean, boolean, boolean)} with
+   * all possible combinations of "simulate" parameters.
+   *
+   * @param extractor The {@link Extractor} to be tested.
+   * @param sampleFile The path to the input sample.
+   * @param instrumentation To be used to load the sample file.
+   * @throws IOException If reading from the input fails.
+   * @throws InterruptedException If interrupted while reading from the input.
+   * @see #assertOutput(Extractor, String, Instrumentation, boolean, boolean, boolean)
+   */
+  public static void assertOutput(Extractor extractor, String sampleFile,
+      Instrumentation instrumentation) throws IOException, InterruptedException {
+    assertOutput(extractor, sampleFile, instrumentation, false, false, false);
+    assertOutput(extractor, sampleFile, instrumentation,  true, false, false);
+    assertOutput(extractor, sampleFile, instrumentation, false,  true, false);
+    assertOutput(extractor, sampleFile, instrumentation,  true,  true, false);
+    assertOutput(extractor, sampleFile, instrumentation, false, false,  true);
+    assertOutput(extractor, sampleFile, instrumentation,  true, false,  true);
+    assertOutput(extractor, sampleFile, instrumentation, false,  true,  true);
+    assertOutput(extractor, sampleFile, instrumentation,  true,  true,  true);
+  }
+
+  /**
+   * Asserts that {@code extractor} consumes {@code sampleFile} successfully and its output equals
+   * to a prerecorded output dump file. The prerecorded output dump file name is determined by
+   * appending "{@value UNKNOWN_LENGTH_EXTENSION}" if {@code simulateUnknownLength} is true and
+   * appending "{@value DUMP_EXTENSION}" to the end of {@code sampleFile}.
+   *
+   * @param extractor The {@link Extractor} to be tested.
+   * @param sampleFile The path to the input sample.
+   * @param instrumentation To be used to load the sample file.
+   * @param simulateIOErrors If true simulates IOErrors.
+   * @param simulateUnknownLength If true simulates unknown input length.
+   * @param simulatePartialReads If true simulates partial reads.
+   * @return The {@link FakeExtractorOutput} used in the test.
+   * @throws IOException If reading from the input fails.
+   * @throws InterruptedException If interrupted while reading from the input.
+   */
+  public static FakeExtractorOutput assertOutput(Extractor extractor, String sampleFile,
+      Instrumentation instrumentation, boolean simulateIOErrors, boolean simulateUnknownLength,
+      boolean simulatePartialReads) throws IOException, InterruptedException {
+    byte[] fileData = getByteArray(instrumentation, sampleFile);
+    FakeExtractorInput input = new FakeExtractorInput.Builder().setData(fileData)
+        .setSimulateIOErrors(simulateIOErrors)
+        .setSimulateUnknownLength(simulateUnknownLength)
+        .setSimulatePartialReads(simulatePartialReads).build();
+
+    Assert.assertTrue(sniffTestData(extractor, input));
+    input.resetPeekPosition();
+    FakeExtractorOutput extractorOutput = consumeTestData(extractor, input, true);
+
+    String dumpFile = sampleFile;
+    if (simulateUnknownLength) {
+      dumpFile += UNKNOWN_LENGTH_EXTENSION;
+    }
+    dumpFile += DUMP_EXTENSION;
+    extractorOutput.assertOutput(instrumentation, dumpFile);
+
+    return extractorOutput;
+  }
+
 }
diff --git a/library/src/main/java/com/google/android/exoplayer/extractor/ogg/FlacReader.java b/library/src/main/java/com/google/android/exoplayer/extractor/ogg/FlacReader.java
index 7964429964..e234bb061f 100644
--- a/library/src/main/java/com/google/android/exoplayer/extractor/ogg/FlacReader.java
+++ b/library/src/main/java/com/google/android/exoplayer/extractor/ogg/FlacReader.java
@@ -55,8 +55,7 @@ import java.util.List;
     }
   }
 
-  //@VisibleForTesting
-  public static boolean isAudioPacket(byte[] data) {
+  private static boolean isAudioPacket(byte[] data) {
     return data[0] == AUDIO_PACKET_TYPE;
   }