@Test public void extract_no_overridden_key_names() {

  BaggageField userId = BaggageField.create("userId");
  BaggageField sessionId = BaggageField.create("sessionId");
  factory = newFactoryBuilder(B3Propagation.FACTORY)
    .add(SingleBaggageField.local(userId))
    .add(SingleBaggageField.remote(sessionId))
    .build();
  initialize();
  injector.inject(context, request);
  request.put("userid", "bob");
  request.put("sessionid", "12345");
  context = extractor.extract(request).context();
  assertThat(userId.getValue(context)).isNull();
  assertThat(sessionId.getValue(context)).isEqualTo("12345");
}