@Test
  public void testMessageSyncInterval() throws Exception {
    CacheCreation cache = new CacheCreation();
    cache.setMessageSyncInterval(123);
    RegionAttributesCreation attrs = new RegionAttributesCreation(cache);
    attrs.setDataPolicy(DataPolicy.NORMAL);
    cache.createVMRegion("rootNORMAL", attrs);
    testXml(cache);
    Cache c = getCache();
    assertNotNull(c);
    assertEquals(123, c.getMessageSyncInterval());
  }
Tests the {@code message-sync-interval} attribute of attribute is related to HA of
client-queues in gemfire ca framework. This attribute is the frequency at which a messent by
the primary cache-server node to all the secondary cache-server nodes to remove the events
which have already been dispatched from the queue
geode-core/src/distributedTest/java/org/apache/geode/cache30/CacheXml66DUnitTest.java