private static void createManager(CacheRule cacheRule) {
    Properties config = new Properties();
    config.put(JMX_MANAGER, "true");
    config.put(JMX_MANAGER_START, "true");
    config.put(JMX_MANAGER_PORT, "0");
    config.put(HTTP_SERVICE_PORT, "0");
    config.put(ENABLE_TIME_STATISTICS, "true");
    config.put(STATISTIC_SAMPLING_ENABLED, "true");

    cacheRule.createCache(config);
  }
Please don't delete verifySystemNotifications. We need to improve verification in this test
class and fix whatever flakiness is in this method.
geode-core/src/distributedTest/java/org/apache/geode/management/RegionManagementDUnitTest.java