[archivant] added tests for update_attachment
[archivant] added tests for update_attachment

leophys/libreant,ael-code/libreant,insomnia-lab/libreant,leophys/libreant,insomnia-lab/libreant,leophys/libreant,leophys/libreant,ael-code/libreant,insomnia-lab/libreant,ael-code/libreant,insomnia-lab/libreant,ael-code/libreant