public XAConnectionFactory xaConnectionFactory(XAConnectionFactory xaConnectionFactory) {
    return TracingXAConnectionFactory.create(xaConnectionFactory, this);
  }
@Test void xaConnectionFactory_wrapsInput() {
    assertThat(jmsTracing.xaConnectionFactory(mock(XAConnectionFactory.class)))
      .isInstanceOf(TracingXAConnectionFactory.class);
  }