@Test public void parseB3SingleFormat_middleOfString() {

  String input = "b3=" + traceIdHigh + traceId + "-" + spanId + ",";
  assertThat(parseB3SingleFormat(input, 3, input.length() - 1).context())
    .isEqualToComparingFieldByField(TraceContext.newBuilder()
      .traceIdHigh(Long.parseUnsignedLong(traceIdHigh, 16))
      .traceId(Long.parseUnsignedLong(traceId, 16))
      .spanId(Long.parseUnsignedLong(spanId, 16)).build()
    );
}