@Test public void nextSpan_prefers_b3_header() {

  TraceContext incoming = newTraceContext(SamplingFlags.NOT_SAMPLED);
  setStringProperty(message, "b3", B3SingleFormat.writeB3SingleFormat(incoming));
  Span child;
  try (Scope ws = tracing.currentTraceContext().newScope(parent)) {
    child = jmsTracing.nextSpan(message);
  }
  assertChildOf(child.context(), incoming);
  assertThat(child.isNoop()).isTrue();
}