@Override
      public Object call() {
        TXManagerImpl mgr = getGemfireCache().getTxManager();
        assertTrue(mgr.isHostedTxInProgress(txId));
        return null;
      }
Tests the basic client-server transaction functionality
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ClientServerTransactionDUnitTest.java