@Test(groups = TestGroup.UNIT)
  public void roundTrip() throws IOException {
    InputStream source1 = new ByteArrayInputStream(s_json.getBytes());
    ByteArrayOutputStream sink1 = new ByteArrayOutputStream();
    Compressor.compressStream(source1, sink1);

    InputStream source2 = new ByteArrayInputStream(sink1.toByteArray());
    ByteArrayOutputStream sink2 = new ByteArrayOutputStream();
    Compressor.decompressStream(source2, sink2);
    assertEquals(s_json, sink2.toString());
  }