@Test public void parseBytes_unsupportedFieldIdThird_toSampledNull() {

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