public static ByteArrayDataOutput newDataOutput() {
    return newDataOutput(new ByteArrayOutputStream());
  }

  /**
   * Returns a new {@link ByteArrayDataOutput} instance sized to hold {@code size} bytes before
   * resizing.
   *
   * @throws IllegalArgumentException if {@code size} is negative
   */
  @J2ktIncompatible
  public static ByteArrayDataOutput newDataOutput(int size) {

    assertEquals(0x12345678, in.readInt());
  }

  public void testNewDataOutput_empty() {
    ByteArrayDataOutput out = ByteStreams.newDataOutput();
    assertThat(out.toByteArray()).isEmpty();
  }

  public void testNewDataOutput_writeInt() {
    ByteArrayDataOutput out = ByteStreams.newDataOutput();
    out.writeInt(0x12345678);
    out.writeInt(0x76543210);
    assertThat(out.toByteArray()).isEqualTo(bytes);
  }

    assertEquals(0x12345678, in.readInt());
  }

  public void testNewDataOutput_empty() {
    ByteArrayDataOutput out = ByteStreams.newDataOutput();
    assertThat(out.toByteArray()).isEmpty();
  }

  public void testNewDataOutput_writeInt() {
    ByteArrayDataOutput out = ByteStreams.newDataOutput();
    out.writeInt(0x12345678);
    out.writeInt(0x76543210);
    assertThat(out.toByteArray()).isEqualTo(bytes);
  }

   *
   * <p>If you need to convert and concatenate several values (possibly even of different types),
   * use a shared {@link java.nio.ByteBuffer} instance, or use {@link
   * com.google.common.io.ByteStreams#newDataOutput()} to get a growable buffer.
   */
  public static byte[] toByteArray(int value) {
    return new byte[] {
      (byte) (value >> 24), (byte) (value >> 16), (byte) (value >> 8), (byte) value
    };
  }