+%% \ottava
+\test "" ##[ \ottava #1 #] % OttavaMusic
+
+%% \tweak
+\test "" ##[ < \tweak #'duration-log #2 c > #]
+\test "" ##[ < c \tweak #'transparent ##t e > #]
+\test "" ##[ < \tweak #'color #'(1.0 0.0 0.0) \tweak #'duration-log #2 c > #]
+\test "" ##[ c-\tweak #'font-size #3 -> #]