FileBackedOutputStream out = new FileBackedOutputStream(50);
    ByteSource source = out.asByteSource();

    if (JAVA_IO_TMPDIR.value().equals("/sdcard")) {
      assertThrows(IOException.class, () -> out.write(data));
      return;
    }
    out.write(data);
    assertTrue(Arrays.equals(data, source.read()));

    out.close();
    assertThrows(IOException.class, () -> out.write(42));

  private LittleEndianDataOutputStream out = new LittleEndianDataOutputStream(baos);

  public void testWriteLittleEndian() throws IOException {

    /* Write out various test values in LITTLE ENDIAN FORMAT */
    out.write(new byte[] {-100, 100});
    out.writeBoolean(true);
    out.writeBoolean(false);
    out.writeByte(100);
    out.writeByte(-100);
    out.writeByte((byte) 200);
    out.writeChar('a');

  public void testCount() throws Exception {
    int written = 0;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    CountingOutputStream counter = new CountingOutputStream(out);
    assertEquals(written, out.size());
    assertEquals(written, counter.getCount());

    counter.write(0);
    written += 1;
    assertEquals(written, out.size());
    assertEquals(written, counter.getCount());

    byte[] data = new byte[10];

  public void testCount() throws Exception {
    int written = 0;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    CountingOutputStream counter = new CountingOutputStream(out);
    assertEquals(written, out.size());
    assertEquals(written, counter.getCount());

    counter.write(0);
    written += 1;
    assertEquals(written, out.size());
    assertEquals(written, counter.getCount());

    byte[] data = new byte[10];

        }

        for (CharSink out : BROKEN_SINKS) {
          runFailureTest(newNormalCharSource(), out);
          assertTrue(logHandler.getStoredLogRecords().isEmpty());

          runFailureTest(BROKEN_CLOSE_SOURCE, out);
          assertEquals(1, getAndResetRecords(logHandler));
        }

        for (CharSource in : BROKEN_SOURCES) {
          for (CharSink out : BROKEN_SINKS) {

   *
   * @param out the output stream to be wrapped
   */
  public CountingOutputStream(OutputStream out) {
    super(checkNotNull(out));
  }

  /** Returns the number of bytes written. */
  public long getCount() {
    return count;
  }

  @Override
  public void write(byte[] b, int off, int len) throws IOException {
    out.write(b, off, len);
    count += len;
  }

   */
  public void write(CharSequence charSequence) throws IOException {
    checkNotNull(charSequence);

    Closer closer = Closer.create();
    try {
      Writer out = closer.register(openStream());
      out.append(charSequence);
      out.flush(); // https://code.google.com/p/guava-libraries/issues/detail?id=1330
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }

    @Override
    public ByteSource createSource(byte[] bytes) throws IOException {
      checkNotNull(bytes);
      File file = createFile();
      OutputStream out = new FileOutputStream(file);
      try {
        out.write(bytes);
      } finally {
        out.close();
      }
      return Files.asByteSource(file);
    }

    @Override
    public byte[] getExpected(byte[] bytes) {

  private final ImmutableSet<TestOption> options;
  private boolean closed;

  public TestOutputStream(OutputStream out, TestOption... options) throws IOException {
    this(out, Arrays.asList(options));
  }

  public TestOutputStream(OutputStream out, Iterable<TestOption> options) throws IOException {
    super(checkNotNull(out));
    this.options = ImmutableSet.copyOf(options);
    throwIf(OPEN_THROWS);
  }

  public boolean closed() {

        final ByteArrayOutputStream out = new ByteArrayOutputStream();

        @Override
        protected HashCode makeHash() {
          return HashCode.fromBytes(out.toByteArray());
        }

        @Override
        protected void process(ByteBuffer bb) {
          while (bb.hasRemaining()) {
            out.write(bb.get());
          }
        }

        @Override