@Override
    public String[] getArrayProperty(final String key, final String delimiter, final String[] defaultValue) {
        return new String[0];
    }
set file name.
@param fileName fileName
shenyu-sync-data-center/shenyu-sync-data-polaris/src/test/java/org/apache/shenyu/sync/data/polaris/handler/PolarisMockConfigFile.java