diff --git a/library/core/src/test/java/com/google/android/exoplayer2/upstream/cache/CacheWriterTest.java b/library/core/src/test/java/com/google/android/exoplayer2/upstream/cache/CacheWriterTest.java
index 6064783e08..4c2fd3f765 100644
--- a/library/core/src/test/java/com/google/android/exoplayer2/upstream/cache/CacheWriterTest.java
+++ b/library/core/src/test/java/com/google/android/exoplayer2/upstream/cache/CacheWriterTest.java
@@ -17,7 +17,6 @@ package com.google.android.exoplayer2.upstream.cache;
 
 import static com.google.android.exoplayer2.testutil.CacheAsserts.assertCachedData;
 import static com.google.common.truth.Truth.assertThat;
-import static java.lang.Math.min;
 import static org.junit.Assert.assertThrows;
 
 import android.net.Uri;
@@ -36,65 +35,18 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.Answers;
-import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
 /** Unit tests for {@link CacheWriter}. */
 @RunWith(AndroidJUnit4.class)
 public final class CacheWriterTest {
 
-  /**
-   * Abstract fake Cache implementation used by the test. This class must be public so Mockito can
-   * create a proxy for it.
-   */
-  public abstract static class AbstractFakeCache implements Cache {
-
-    // This array is set to alternating length of cached and not cached regions in tests:
-    // spansAndGaps = {<length of 1st cached region>, <length of 1st not cached region>,
-    //    <length of 2nd cached region>, <length of 2nd not cached region>, ... }
-    // Ideally it should end with a cached region but it shouldn't matter for any code.
-    private int[] spansAndGaps;
-    private long contentLength;
-
-    private void init() {
-      spansAndGaps = new int[] {};
-      contentLength = C.LENGTH_UNSET;
-    }
-
-    @Override
-    public long getCachedLength(String key, long position, long length) {
-      if (length == C.LENGTH_UNSET) {
-        length = Long.MAX_VALUE;
-      }
-      for (int i = 0; i < spansAndGaps.length; i++) {
-        int spanOrGap = spansAndGaps[i];
-        if (position < spanOrGap) {
-          long left = min(spanOrGap - position, length);
-          return (i & 1) == 1 ? -left : left;
-        }
-        position -= spanOrGap;
-      }
-      return -length;
-    }
-
-    @Override
-    public ContentMetadata getContentMetadata(String key) {
-      DefaultContentMetadata metadata = new DefaultContentMetadata();
-      ContentMetadataMutations mutations = new ContentMetadataMutations();
-      ContentMetadataMutations.setContentLength(mutations, contentLength);
-      return metadata.copyWithMutationsApplied(mutations);
-    }
-  }
-
-  @Mock(answer = Answers.CALLS_REAL_METHODS) private AbstractFakeCache mockCache;
   private File tempFolder;
   private SimpleCache cache;
 
   @Before
   public void setUp() throws Exception {
     MockitoAnnotations.initMocks(this);
-    mockCache.init();
     tempFolder =
         Util.createTempDirectory(ApplicationProvider.getApplicationContext(), "ExoPlayerTest");
     cache =