public static RabbitMQCollector.Builder collectorBuilder(
      AnnotationConfigApplicationContext context) throws Exception {
    return context.getBean(ZipkinRabbitMQCollectorProperties.class).toBuilder();
  }
Just registering properties to avoid automatically connecting to a Rabbit MQ server
zipkin-server/src/test/java/zipkin2/server/internal/rabbitmq/Access.java