Basic test framework in place

Makefile

@@ -1,6 +1,13 @@
+CC=tcc
+all: tests
 run: shortcodes
 	./shortcodes
 shortcodes.c: shortcodes.rl
 	ragel -G2 shortcodes.rl -o shortcodes.c
 shortcodes: shortcodes.c
-	tcc shortcodes.c -lbg -g -o shortcodes
+	$(CC) shortcodes.c -lbg -g -o shortcodes
+tests: shortcodes.c shortcodes.h tests.c
+	$(CC) tests.c shortcodes.c -lbg -lcgreen -g -o tests
+	./tests
+clean:
+	rm -f shortcodes shortcodes.c