public TestCharSource(String content, TestOption... options) {
    this.byteSource = new TestByteSource(content.getBytes(UTF_8), options);
  }

  @Override
  public boolean wasStreamOpened() {
    return byteSource.wasStreamOpened();
  }

  @Override
  public boolean wasStreamClosed() {
    return byteSource.wasStreamClosed();
  }

  @Override
  public Reader openStream() throws IOException {

    assertEquals("", sink.getString());
    sink.write(STRING);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());
    assertEquals(STRING, sink.getString());
  }

  public void testWriteFrom_reader() throws IOException {
    StringReader reader = new StringReader(STRING);
    sink.writeFrom(reader);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());
    assertEquals(STRING, sink.getString());
  }

    sink.write(bytes);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());
    assertArrayEquals(bytes, sink.getBytes());
  }

  public void testWriteFrom_inputStream() throws IOException {
    ByteArrayInputStream in = new ByteArrayInputStream(bytes);
    sink.writeFrom(in);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());
    assertArrayEquals(bytes, sink.getBytes());
  }

    sink.write(bytes);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());
    assertArrayEquals(bytes, sink.getBytes());
  }

  public void testWriteFrom_inputStream() throws IOException {
    ByteArrayInputStream in = new ByteArrayInputStream(bytes);
    sink.writeFrom(in);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());
    assertArrayEquals(bytes, sink.getBytes());
  }

    this.byteSink = new TestByteSink(options);
  }

  public String getString() {
    return new String(byteSink.getBytes(), UTF_8);
  }

  @Override
  public boolean wasStreamOpened() {
    return byteSink.wasStreamOpened();
  }

  @Override
  public boolean wasStreamClosed() {
    return byteSink.wasStreamClosed();
  }

  @Override
  public Writer openStream() throws IOException {

  public TestByteSink(TestOption... options) {
    this.options = ImmutableSet.copyOf(options);
  }

  byte[] getBytes() {
    return bytes.toByteArray();
  }

  @Override
  public boolean wasStreamOpened() {
    return outputStreamOpened;
  }

  @Override
  public boolean wasStreamClosed() {
    return outputStreamClosed;
  }

  @Override
  public OutputStream openStream() throws IOException {

  TestByteSource(byte[] bytes, TestOption... options) {
    this.bytes = checkNotNull(bytes);
    this.options = ImmutableSet.copyOf(options);
  }

  @Override
  public boolean wasStreamOpened() {
    return inputStreamOpened;
  }

  @Override
  public boolean wasStreamClosed() {
    return inputStreamClosed;
  }

  @Override
  public InputStream openStream() throws IOException {

  TestByteSource(byte[] bytes, TestOption... options) {
    this.bytes = checkNotNull(bytes);
    this.options = ImmutableSet.copyOf(options);
  }

  @Override
  public boolean wasStreamOpened() {
    return inputStreamOpened;
  }

  @Override
  public boolean wasStreamClosed() {
    return inputStreamClosed;
  }

  @Override
  public InputStream openStream() throws IOException {