@Test
public void testValidClientEmptyBlacklist() throws Exception {

  final Supplier<Set<String>> supplier = Set::of;
  RequestContext requestContext = mockRequestContext(true);
  Response<Object> response = awaitResponse(Middlewares.clientValidator(supplier)
      .apply(mockInnerHandler(requestContext))
      .invoke(requestContext));
  assertThat(response, hasStatus(withCode(Status.OK)));
}