@Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof ConfigFileMetadata)) {
            return false;
        }
        final ConfigFileMetadata that = (ConfigFileMetadata) o;
        return Objects.equals(getNamespace(), that.getNamespace()) && Objects.equals(getFileGroup(), that.getFileGroup())
                   && Objects.equals(getFileName(), that.getFileName());
    }
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