@Test
  public void testOverflowAndBackup() throws Exception {
    CacheCreation cache = new CacheCreation();

    RegionAttributesCreation attrs = new RegionAttributesCreation(cache);
    attrs.setMirrorType(MirrorType.KEYS_VALUES);
    attrs.setPersistBackup(true);

    cache.createRegion("root", attrs);

    testXml(cache);
  }
Tests the {@code overflowThreshold} and {@code persistBackup} related attributes
geode-core/src/distributedTest/java/org/apache/geode/cache30/CacheXml66DUnitTest.java