@Override
      public void run() {
        addIgnoredException("service failure");
        addIgnoredException("Possible loss of quorum");
        addIgnoredException(ForcedDisconnectException.class);

        hook = new TestHook();
        MembershipManagerHelper.addTestHook(system, hook);
        try {
          MembershipManagerHelper.crashDistributedSystem(system);
        } finally {
          hook.reset();
        }
      }
test lead member failure and normal coordinator shutdown with network partition detection
enabled.
<p>
Start one locators with admin distributed systems, then start two regular distributed members.
<p>
We kill the lead member and demonstrate that the other members continue to operate normally.
<p>
We then shut down the group coordinator and observe the second locator pick up the job and the
remaining member continues to operate normally.
geode-core/src/distributedTest/java/org/apache/geode/distributed/LocatorDUnitTest.java