@Override
      public Object call() {
        TestTxListener l = (TestTxListener) getCache().getTXMgr().getListener();
        assertThat(l.isListenerInvoked()).isTrue();
        return null;
      }
@return first key found on the given member
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/RemoteTransactionDUnitTest.java