@Test public void getByName() {

  assertThat(BaggageField.getByName(emptyContext, REQUEST_ID.name()))
    .isSameAs(REQUEST_ID);
  try (Tracing tracing = Tracing.newBuilder().build();
       Scope ws = tracing.currentTraceContext().newScope(emptyContext)) {
    assertThat(BaggageField.getByName(REQUEST_ID.name()))
      .isSameAs(REQUEST_ID);
  }
}