@Override
  public Properties getDistributedSystemProperties() {
    Properties props = super.getDistributedSystemProperties();
    if (xmlProps != null) {
      for (final Map.Entry<Object, Object> objectObjectEntry : xmlProps.entrySet()) {
        Map.Entry entry = (Map.Entry) objectObjectEntry;
        String key = (String) entry.getKey();
        String value = (String) entry.getValue();
        props.setProperty(key, value);
      }
    }
    return props;
  }
These properties, if any, will be added to the properties used for getSystem calls
geode-core/src/distributedTest/java/org/apache/geode/cache30/CacheXml66DUnitTest.java