@Override
      public void afterRoleLoss(RoleEvent event) {
        RegionReliabilityListenerDUnitTest.rolesLoss = event.getRequiredRoles();
      }
Tests the notification of afterRoleGain and afterRoleLoss
geode-core/src/distributedTest/java/org/apache/geode/cache30/RegionReliabilityListenerDUnitTest.java