@Test
public void testSendsRequestId() throws Exception {

  when(client.send(requestCaptor.capture())).thenReturn(CompletableFuture.completedFuture(
      response(HTTP_OK, Collections.emptyList())));
  styx.workflows();
  final Request request = requestCaptor.getValue();
  assertThat(request.header("X-Request-Id"), isValidUuid());
}