@Override
        public void run() {
          disconnectFromDS();
          Properties config = new Properties();
          config.setProperty(ROLES, vmRoles[vm]);
          config.setProperty(LOG_LEVEL, "fine");
          distributionProperties = config;
          getSystem();
        }
Tests usage of Roles in four distributed vms.
geode-core/src/distributedTest/java/org/apache/geode/distributed/RoleDUnitTest.java