public XATopicConnection xaTopicConnection(XATopicConnection connection) {
    return TracingXAConnection.create(connection, this);
  }
@Test void xaTopicConnection_doesntDoubleWrap() {
    XATopicConnection wrapped = jmsTracing.xaTopicConnection(mock(XATopicConnection.class));
    assertThat(jmsTracing.xaTopicConnection(wrapped))
      .isSameAs(wrapped);
  }