@Test public void decorateRabbitTemplate_skips_when_present() {

  RabbitTemplate template = new RabbitTemplate();
  template.setBeforePublishPostProcessors(new TracingMessagePostProcessor(rabbitTracing));
  assertThat(rabbitTracing.decorateRabbitTemplate(template))
    .extracting("beforePublishPostProcessors")
    .satisfies(l -> assertThat((List<?>) l).hasSize(1));
}