out.reset();
  }


  public void testResetWhenGarbageCollected() throws Exception {
    FileAndWeakByteSource fileAndSource = leakFileBackedOutputStream();
    File file = fileAndSource.file;
    WeakReference<ByteSource> sourceRef = fileAndSource.sourceRef;
    fileAndSource = null;
    awaitClear(sourceRef);
    awaitDone(() -> !file.exists());
  }