@Override
  protected Properties getConfig() {
    Properties config = super.getConfig();
    config.setProperty(DISTRIBUTED_TRANSACTIONS, "true");
    return config;
  }
Extends {@link TXExpirationIntegrationTest} with "distributed-transactions" enabled.
geode-core/src/integrationTest/java/org/apache/geode/disttx/DistributedTXExpirationIntegrationTest.java