public XAQueueConnection xaQueueConnection(XAQueueConnection connection) {
    return TracingXAConnection.create(connection, this);
  }
@Test void xaQueueConnection_doesntDoubleWrap() {
    XAQueueConnection wrapped = jmsTracing.xaQueueConnection(mock(XAQueueConnection.class));
    assertThat(jmsTracing.xaQueueConnection(wrapped))
      .isSameAs(wrapped);
  }