@Override
      public void memberJoined(ClientMembershipEvent event) {
        fired[0] = true;
        member[0] = event.getMember();
        memberId[0] = event.getMemberId();
        isClient[0] = event.isClient();
      }
Tests unregisterClientMembershipListener to ensure that no further events are delivered to
unregistered listeners.
geode-core/src/distributedTest/java/org/apache/geode/cache30/ClientMembershipDUnitTest.java