-%crescpoco = \property Voice.crescendoText = "cresc. poco a poco"
-%decresc = \property Voice.crescendoText = "decr."
-%dim = \property Voice.crescendoText = "dim."
+%crescpoco = \set crescendoText = "cresc. poco a poco"
+%decresc = \set crescendoText = "decr."
+%dim = \set crescendoText = "dim."
+
+
+% for regression testing purposes.
+assertBeamQuant =
+#(def-music-function (parser location l r) (pair? pair?)
+ (let* ((f (check-quant-callbacks l r)))
+
+ #{
+ \once \override Beam #'position-callbacks = $f
+ #}
+
+))
+
+% for regression testing purposes.
+assertBeamSlope =
+#(def-music-function (parser location comp) (procedure?)
+ (let* ((f (check-slope-callbacks comp)))
+
+ #{
+ \once \override Beam #'position-callbacks = $f
+ #}
+
+))
+