return this;
    }

    @Override
    public void flush() {
      flushed = true;
    }

    @Override
    public void close() {
      closed = true;
    }
  }

  public void testWriteMethods() throws IOException {
    StringBuilder builder = new StringBuilder();
    Writer writer = new AppendableWriter(builder);

    writer.write("Hello".toCharArray());
    writer.write(',');