@Test
  public void testGetDifferentSystemAfterClose() {
    Properties config = createLonerConfig();

    DistributedSystem system1 = DistributedSystem.connect(config);
    system1.disconnect();

    int time = DEFAULT_ACK_WAIT_THRESHOLD + 17;
    config.put(ACK_WAIT_THRESHOLD, String.valueOf(time));

    DistributedSystem system2 = DistributedSystem.connect(config);
    system2.disconnect();
  }
Tests getting a system with a different configuration after another system has been closed.
geode-core/src/distributedTest/java/org/apache/geode/distributed/DistributedSystemDUnitTest.java