@Test public void inject_prefixed() {

  factory = newFactoryBuilder(B3Propagation.FACTORY)
    .addField("x-vcap-request-id")
    .addPrefixedFields("baggage-", asList("country-code"))
    .build();
  initialize();
  BaggageField.getByName(context, "x-vcap-request-id").updateValue(context, uuid);
  BaggageField.getByName(context, "country-code").updateValue(context, "FO");
  injector.inject(context, request);
  assertThat(request)
    .containsEntry("baggage-country-code", "FO")
    .containsEntry("x-vcap-request-id", uuid);
}