diff --git a/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeRenderer.java b/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeRenderer.java
index b13092fb0d..a66043b77f 100644
--- a/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeRenderer.java
+++ b/testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeRenderer.java
@@ -35,16 +35,19 @@ import junit.framework.Assert;
 public class FakeRenderer extends BaseRenderer {
 
   private final List<Format> expectedFormats;
+  private final DecoderInputBuffer buffer;
 
   public int positionResetCount;
   public int formatReadCount;
   public int bufferReadCount;
   public boolean isEnded;
+  public boolean isReady;
 
   public FakeRenderer(Format... expectedFormats) {
     super(expectedFormats.length == 0 ? C.TRACK_TYPE_UNKNOWN
         : MimeTypes.getTrackType(expectedFormats[0].sampleMimeType));
     this.expectedFormats = Collections.unmodifiableList(Arrays.asList(expectedFormats));
+    this.buffer = new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_NORMAL);
   }
 
   @Override
@@ -55,29 +58,26 @@ public class FakeRenderer extends BaseRenderer {
 
   @Override
   public void render(long positionUs, long elapsedRealtimeUs) throws ExoPlaybackException {
-    if (isEnded) {
-      return;
-    }
-
-    // Verify the format matches the expected format.
-    FormatHolder formatHolder = new FormatHolder();
-    DecoderInputBuffer buffer =
-        new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_NORMAL);
-    int result = readSource(formatHolder, buffer, false);
-    if (result == C.RESULT_FORMAT_READ) {
-      formatReadCount++;
-      Assert.assertTrue(expectedFormats.contains(formatHolder.format));
-    } else if (result == C.RESULT_BUFFER_READ) {
-      bufferReadCount++;
-      if (buffer.isEndOfStream()) {
-        isEnded = true;
+    if (!isEnded) {
+      // Verify the format matches the expected format.
+      FormatHolder formatHolder = new FormatHolder();
+      int result = readSource(formatHolder, buffer, false);
+      if (result == C.RESULT_FORMAT_READ) {
+        formatReadCount++;
+        Assert.assertTrue(expectedFormats.contains(formatHolder.format));
+      } else if (result == C.RESULT_BUFFER_READ) {
+        bufferReadCount++;
+        if (buffer.isEndOfStream()) {
+          isEnded = true;
+        }
       }
     }
+    isReady = buffer.timeUs >= positionUs;
   }
 
   @Override
   public boolean isReady() {
-    return isSourceReady();
+    return isReady || isSourceReady();
   }
 
   @Override
@@ -87,8 +87,8 @@ public class FakeRenderer extends BaseRenderer {
 
   @Override
   public int supportsFormat(Format format) throws ExoPlaybackException {
-    return getTrackType() == MimeTypes.getTrackType(format.sampleMimeType) ? FORMAT_HANDLED
-        : FORMAT_UNSUPPORTED_TYPE;
+    return getTrackType() == MimeTypes.getTrackType(format.sampleMimeType)
+        ? (FORMAT_HANDLED | ADAPTIVE_SEAMLESS) : FORMAT_UNSUPPORTED_TYPE;
   }
 
 }