Ensure that tests do not leave any files behind

[snejus]

I have been running tests across the codebase frequently these days and have just discovered thousands of files in my /tmp directory. For example, I checked which tests from test/plugins directory leave files behind:

for fi in test/plugins/*.py; do 
  print Testing $fi && pytest $fi &>/dev/null
  drs=(/tmp/tmp*)
  if (( $#drs )); then 
    print -l $drs && rm -r $drs
  fi
done

Testing test/plugins/__init__.py
Testing test/plugins/lyrics_download_samples.py
Testing test/plugins/test_acousticbrainz.py
Testing test/plugins/test_advancedrewrite.py
Testing test/plugins/test_albumtypes.py
Testing test/plugins/test_art.py
/tmp/tmp2gwz0iin.jpg
/tmp/tmp7gxr676p.jpg
/tmp/tmp88ypd9a4.png
/tmp/tmpc9_dhkt1.jpg
/tmp/tmpjlro_7kl.png
/tmp/tmprehbg2uh.jpg
/tmp/tmps37w1k7g.jpg
/usr/bin/rm: remove 7 arguments recursively? y
removed '/tmp/tmp2gwz0iin.jpg'
removed '/tmp/tmp7gxr676p.jpg'
removed '/tmp/tmp88ypd9a4.png'
removed '/tmp/tmpc9_dhkt1.jpg'
removed '/tmp/tmpjlro_7kl.png'
removed '/tmp/tmprehbg2uh.jpg'
removed '/tmp/tmps37w1k7g.jpg'
Testing test/plugins/test_bareasc.py
/tmp/tmposwaq51j
/tmp/tmpqdoitx3p
/tmp/tmpqj57zdnm
/usr/bin/rm: remove 3 arguments recursively? y
removed directory '/tmp/tmposwaq51j/libdir'
removed directory '/tmp/tmposwaq51j'
removed directory '/tmp/tmpqdoitx3p/libdir'
removed directory '/tmp/tmpqdoitx3p'
removed directory '/tmp/tmpqj57zdnm/libdir'
removed directory '/tmp/tmpqj57zdnm'
Testing test/plugins/test_beatport.py
Testing test/plugins/test_bucket.py
Testing test/plugins/test_convert.py
Testing test/plugins/test_discogs.py
Testing test/plugins/test_edit.py
Testing test/plugins/test_embedart.py
/tmp/tmp04pf5orx
/tmp/tmp0p3zrmvr
/tmp/tmp1c_13z5i
/tmp/tmp1iwishs_.jpg
/tmp/tmpfl7et0y5
/tmp/tmpfu9vpdi9
/tmp/tmph5to5ktl
/tmp/tmpiemkfj5o
/tmp/tmpn__of7he
/tmp/tmpp1hnf3dh
/tmp/tmppumez7dg
/tmp/tmpqxlwwq42.jpg
/tmp/tmpr__5fn99
/tmp/tmptks_h0e7
/tmp/tmpv7f27emo
/tmp/tmpvp2regn7
/tmp/tmpw8dq5diz
/tmp/tmpxy4kl2i8
/usr/bin/rm: remove 18 arguments recursively? y
removed directory '/tmp/tmp04pf5orx'
removed directory '/tmp/tmp0p3zrmvr'
removed directory '/tmp/tmp1c_13z5i'
removed '/tmp/tmp1iwishs_.jpg'
removed directory '/tmp/tmpfl7et0y5'
removed directory '/tmp/tmpfu9vpdi9'
removed directory '/tmp/tmph5to5ktl'
removed directory '/tmp/tmpiemkfj5o'
removed directory '/tmp/tmpn__of7he'
removed directory '/tmp/tmpp1hnf3dh'
removed directory '/tmp/tmppumez7dg'
removed '/tmp/tmpqxlwwq42.jpg'
removed directory '/tmp/tmpr__5fn99'
removed directory '/tmp/tmptks_h0e7'
removed directory '/tmp/tmpv7f27emo'
removed directory '/tmp/tmpvp2regn7'
removed directory '/tmp/tmpw8dq5diz'
removed directory '/tmp/tmpxy4kl2i8'
Testing test/plugins/test_embyupdate.py
Testing test/plugins/test_export.py
Testing test/plugins/test_fetchart.py
Testing test/plugins/test_filefilter.py
Testing test/plugins/test_ftintitle.py
Testing test/plugins/test_hook.py
Testing test/plugins/test_ihate.py
Testing test/plugins/test_importadded.py
Testing test/plugins/test_importfeeds.py
Testing test/plugins/test_info.py
Testing test/plugins/test_ipfs.py
Testing test/plugins/test_keyfinder.py
Testing test/plugins/test_lastgenre.py
Testing test/plugins/test_limit.py
Testing test/plugins/test_lyrics.py
Testing test/plugins/test_mbsubmit.py
Testing test/plugins/test_mbsync.py
Testing test/plugins/test_mpdstats.py
Testing test/plugins/test_parentwork.py
Testing test/plugins/test_permissions.py
Testing test/plugins/test_player.py
Testing test/plugins/test_playlist.py
Testing test/plugins/test_play.py
/tmp/tmp0on9a_ru.m3u
/tmp/tmp2lnwq43r.m3u
/tmp/tmp2rjt0boe.m3u
/tmp/tmp3tenj5ru.m3u
/tmp/tmp_6aguiwh.m3u
/tmp/tmp8ggf8znt.m3u
/tmp/tmpel0a12lq.m3u
/tmp/tmpwd0g39m_.m3u
/tmp/tmpwxpl0eas.m3u
/tmp/tmpxzytwbdp.m3u
/usr/bin/rm: remove 10 arguments recursively? y
removed '/tmp/tmp0on9a_ru.m3u'
removed '/tmp/tmp2lnwq43r.m3u'
removed '/tmp/tmp2rjt0boe.m3u'
removed '/tmp/tmp3tenj5ru.m3u'
removed '/tmp/tmp_6aguiwh.m3u'
removed '/tmp/tmp8ggf8znt.m3u'
removed '/tmp/tmpel0a12lq.m3u'
removed '/tmp/tmpwd0g39m_.m3u'
removed '/tmp/tmpwxpl0eas.m3u'
removed '/tmp/tmpxzytwbdp.m3u'
Testing test/plugins/test_plexupdate.py
Testing test/plugins/test_plugin_mediafield.py
Testing test/plugins/test_random.py
Testing test/plugins/test_replaygain.py
Testing test/plugins/test_smartplaylist.py
Testing test/plugins/test_spotify.py
Testing test/plugins/test_subsonicupdate.py
Testing test/plugins/test_the.py
Testing test/plugins/test_thumbnails.py
Testing test/plugins/test_types_plugin.py
Testing test/plugins/test_web.py
Testing test/plugins/test_zero.py
/tmp/tmp4jxe4d30
/usr/bin/rm: remove 1 argument recursively? y
removed '/tmp/tmp4jxe4d30'