public void testClosesOnErrors_whenReadThrows() {
    TestByteSource failSource = new TestByteSource(bytes, READ_THROWS);
    assertThrows(IOException.class, () -> failSource.copyTo(new TestByteSink()));
    assertTrue(failSource.wasStreamClosed());
  }

  public void testClosesOnErrors_copyingToOutputStreamThatThrows() throws IOException {
    TestByteSource okSource = new TestByteSource(bytes);

    assertFalse(in.closed());
  }

  public void testClosesOnErrors_copyingFromByteSourceThatThrows() {
    for (TestOption option : EnumSet.of(OPEN_THROWS, READ_THROWS, CLOSE_THROWS)) {
      TestByteSource failSource = new TestByteSource(new byte[10], option);
      TestByteSink okSink = new TestByteSink();
      assertThrows(IOException.class, () -> failSource.copyTo(okSink));

  public void testClosesOnErrors_whenReadThrows() {
    TestByteSource failSource = new TestByteSource(bytes, READ_THROWS);
    assertThrows(IOException.class, () -> failSource.copyTo(new TestByteSink()));
    assertTrue(failSource.wasStreamClosed());
  }

  public void testClosesOnErrors_copyingToOutputStreamThatThrows() throws IOException {
    TestByteSource okSource = new TestByteSource(bytes);

    assertFalse(in.closed());
  }

  public void testClosesOnErrors_copyingFromByteSourceThatThrows() {
    for (TestOption option : EnumSet.of(OPEN_THROWS, READ_THROWS, CLOSE_THROWS)) {
      TestByteSource failSource = new TestByteSource(new byte[10], option);
      TestByteSink okSink = new TestByteSink();
      assertThrows(IOException.class, () -> failSource.copyTo(okSink));

            }
          });
    }
  }

  private Path createTempFile() throws IOException {
    return Files.createTempFile(tempDir, "test", ".test");
  }

  public void testByteSource_size_ofDirectory() throws IOException {
    try (FileSystem fs = Jimfs.newFileSystem(Configuration.unix())) {
      Path dir = fs.getPath("dir");
      Files.createDirectory(dir);