protected void startCacheServer() throws IOException {
    CacheServer cacheServer = getCache().addCacheServer();
    cacheServer.setPort(0);
    cacheServer.start();
    cacheServerPort = cacheServer.getPort();
  }
Test to make sure we don't leak put all events in the event tracker after multiple putAlls
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/event/EventTrackerDUnitTest.java