[test] Add OpenMPT FineVolColSlide.it test case

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

test-dev/Makefile.in

@@ -123,6 +123,7 @@ OPENMPT_IT	= carrynna \
 		  filter_7f \
 		  filterenvreset \
 		  filter_nna \
+		  finevolcolslide \
 		  flt_env_carry \
 		  freqreset_noins \
 		  gxsmp \

test-dev/test_openmpt_it_finevolcolslide.c

@@ -0,0 +1,16 @@
+#include "test.h"
+
+/*
+ Unlike fine volume slides in the effect column, fine volume slides in the
+ volume column are only ever executed on the first tick — not on multiples of
+ the first tick if there is a pattern delay. Thus, the left and right channel
+ of this example should always have the same volume.
+*/
+
+TEST(test_openmpt_it_finevolcolslide)
+{
+	compare_mixer_data(
+		"openmpt/it/FineVolColSlide.it",
+		"openmpt/it/FineVolColSlide.data");
+}
+END_TEST