public MessageListener messageListener(MessageListener messageListener, boolean addConsumerSpan) {
    if (messageListener instanceof TracingMessageListener) return messageListener;
    return new TracingMessageListener(messageListener, this, addConsumerSpan);
  }
@Test void messageListener_wrapsInput() {
    assertThat(jmsTracing.messageListener(mock(MessageListener.class), false))
      .isInstanceOf(TracingMessageListener.class);
  }