public static void acquirePoolConnection() {
    try {
      Region r1 = cache.getRegion(SEPARATOR + REGION_NAME);
      assertNotNull(r1);
      String poolName = r1.getAttributes().getPoolName();
      assertNotNull(poolName);
      pool = (PoolImpl) PoolManager.find(poolName);
      assertNotNull(pool);
      conn1 = pool.getPrimaryConnection();
      assertNotNull(conn1);
    } catch (Exception ex) {
      throw new RuntimeException("Exception while setting acquireConnections  ", ex);
    }
  }
put on non interest list ep and verify updates
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/InterestListEndpointDUnitTest.java