\test "" ##[ \mark \default #] % MarkEvent
\test "" ##[ \mark "Allegro" #]
\test "" ##[ \tempo 4 = 120 #] % MetronomeChangeEvent
\test "" ##[ \mark \default #] % MarkEvent
\test "" ##[ \mark "Allegro" #]
\test "" ##[ \tempo 4 = 120 #] % MetronomeChangeEvent