@Test public void parseBytes_unsupportedFieldIdSecond_toNull() {

  assertThat(TraceContextBinaryFormat.parseBytes(new byte[] {
    0,
    0, 127, -1, -1, -1, -1, -1, -1, -1, -128, 0, 0, 0, 0, 0, 0, 0,
    4, -1, -1, -1, -1, -1, -1, -1, -1, // bad field number
    2, 1
  }, null)).isNull();
}