\test "" ##[ \mark \default #] % MarkEvent
\test "" ##[ \mark "Allegro" #]
\test "" ##[ \tempo 4 = 120 #] % MetronomeChangeEvent
+\test "" ##[ \tempo 4 = 108 ~ 116 #]
+\test "" ##[ \tempo "Allegro" 4 = 132 #]
+\test "" ##[ \tempo "Andante" #]
%% key, time, clef, bar
\test "" ##[ \key \default #] % KeyChangeEvent