diff --git a/Makefile.am b/Makefile.am
index 79cad25..3bb9c8a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,9 +16,11 @@ seq2gif_CFLAGS = $(MAYBE_COVERAGE)
 
 test: all
 	for ttyfile in tests/data/*.tty; do ./seq2gif -i "$$ttyfile" -o /dev/null; done
-	./seq2gif -i tests/data/sl.tty -o /dev/null
 	! ./seq2gif -i /non-existent-file.tty -o /dev/null
 	! ./seq2gif -i tests/data/sl.tty -o /non-existent-file.out
+	for dither in none fs; do for map in rgb332 xterm256; do \
+	  ./seq2gif -d $$dither -m $$map -i tests/data/ls.tty -o /dev/null; \
+	done; done
 
 coveralls: test
 	coveralls -E '.*\.h' -e tests -e glyph -e m4
diff --git a/Makefile.in b/Makefile.in
index 3d4a527..18c746a 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -952,9 +952,11 @@ uninstall-am: uninstall-binPROGRAMS
 
 test: all
 	for ttyfile in tests/data/*.tty; do ./seq2gif -i "$$ttyfile" -o /dev/null; done
-	./seq2gif -i tests/data/sl.tty -o /dev/null
 	! ./seq2gif -i /non-existent-file.tty -o /dev/null
 	! ./seq2gif -i tests/data/sl.tty -o /non-existent-file.out
+	for dither in none fs; do for map in rgb332 xterm256; do \
+	  ./seq2gif -d $$dither -m $$map -i tests/data/ls.tty -o /dev/null; \
+	done; done
 
 coveralls: test
 	coveralls -E '.*\.h' -e tests -e glyph -e m4