Fix event name collision in tests and update tests
Fix event name collision in tests and update tests

 - Fix `test_event_X` name collision between tests causing tests to
   fail unexpectedly.
 - Update tests to match new hook plugin design (i.e. remove shell and
   subtitution option testing).

sampsyo/beets,diego-plan9/beets,jackwilsdon/beets,sampsyo/beets,mosesfistos1/beetbox,pkess/beets,shamangeorge/beets,artemutin/beets,xsteadfastx/beets,pkess/beets,beetbox/beets,shamangeorge/beets,beetbox/beets,mosesfistos1/beetbox,shamangeorge/beets,ibmibmibm/beets,jcoady9/beets,Freso/beets,lengtche/beets,SusannaMaria/beets,MyTunesFreeMusic/privacy-policy,pkess/beets,MyTunesFreeMusic/privacy-policy,ibmibmibm/beets,xsteadfastx/beets,lengtche/beets,xsteadfastx/beets,madmouser1/beets,jcoady9/beets,madmouser1/beets,SusannaMaria/beets,jackwilsdon/beets,mosesfistos1/beetbox,Freso/beets,shamangeorge/beets,ibmibmibm/beets,lengtche/beets,xsteadfastx/beets,Kraymer/beets,diego-plan9/beets,SusannaMaria/beets,SusannaMaria/beets,Kraymer/beets,MyTunesFreeMusic/privacy-policy,madmouser1/beets,Kraymer/beets,Freso/beets,pkess/beets,artemutin/beets,diego-plan9/beets,MyTunesFreeMusic/privacy-policy,lengtche/beets,artemutin/beets,ibmibmibm/beets,mosesfistos1/beetbox,jcoady9/beets,beetbox/beets,jackwilsdon/beets,jackwilsdon/beets,Kraymer/beets,diego-plan9/beets,sampsyo/beets,beetbox/beets,artemutin/beets,madmouser1/beets,sampsyo/beets,jcoady9/beets,Freso/beets