Zero: rewrite tests.
Zero: rewrite tests.

Rely on plugin interface only.
Unregister listeners by hand for the moment.

Kraymer/beets,pkess/beets,MyTunesFreeMusic/privacy-policy,mosesfistos1/beetbox,ibmibmibm/beets,lengtche/beets,sampsyo/beets,Kraymer/beets,Kraymer/beets,madmouser1/beets,diego-plan9/beets,SusannaMaria/beets,lengtche/beets,beetbox/beets,beetbox/beets,sampsyo/beets,shamangeorge/beets,pkess/beets,SusannaMaria/beets,beetbox/beets,beetbox/beets,lengtche/beets,artemutin/beets,artemutin/beets,diego-plan9/beets,MyTunesFreeMusic/privacy-policy,mosesfistos1/beetbox,pkess/beets,SusannaMaria/beets,jackwilsdon/beets,jackwilsdon/beets,ibmibmibm/beets,sampsyo/beets,lengtche/beets,SusannaMaria/beets,shamangeorge/beets,jackwilsdon/beets,MyTunesFreeMusic/privacy-policy,madmouser1/beets,xsteadfastx/beets,mosesfistos1/beetbox,MyTunesFreeMusic/privacy-policy,artemutin/beets,madmouser1/beets,ibmibmibm/beets,diego-plan9/beets,pkess/beets,shamangeorge/beets,sampsyo/beets,jackwilsdon/beets,shamangeorge/beets,ibmibmibm/beets,xsteadfastx/beets,xsteadfastx/beets,mosesfistos1/beetbox,Kraymer/beets,diego-plan9/beets,xsteadfastx/beets,artemutin/beets,madmouser1/beets