tests: implement a better integration test framework than shellspec

(for our usecase at least)

Makefile

@@ -82,7 +82,8 @@ minishell_objs = $(addsuffix .o,src/$(NAME)) $(objs)
 all_objs = $(minishell_objs)
 deps = $(all_objs:.o=.d)
 
-.PHONY: all clean fclean re norm tests ctests ctestsa ctestsub ctestst alla allub allt
+.PHONY: all clean fclean re norm tests ctests ctestsa ctestsub ctestst alla \
+	allub allt testsa testsub testst inttests inttestsa inttestsub inttestst
 
 all: $(NAME)
 
@@ -116,24 +117,48 @@ norm:
 	norminette src libft | grep -v OK || true
 
 tests:
-	@echo "Running tests with AddressSanitizer..."
-	+CFLAGS="$(CFLAGS) $(ASAN)" make re
-	shellspec
-	+make ctestsa
-
-	@echo "Running tests with UndefinedBehaviourSanitizer..."
-	+CFLAGS="$(CFLAGS) $(UBSAN)" make re
-	shellspec
-	+make ctestsub
-
-	@echo "Running tests with ThreadSanitizer..."
-	+CFLAGS="$(CFLAGS) $(TSAN)" make re
-	shellspec
-	+make ctestst
-
+	+make fclean
+	+make testsa
+	+make fclean
+	+make testsub
+	+make fclean
+	+make testst
 	@echo "All tests passed!"
 
-ctests: $(LIBFT)
+testsa: CFLAGS += $(ASAN)
+testsa:
+	@echo "Running tests with AddressSanitizer..."
+	+make inttests
+	+make ctests
+
+testsub: CFLAGS += $(UBSAN)
+testsub: all
+	@echo "Running tests with UndefinedBehaviourSanitizer..."
+	+make inttests
+	+make ctests
+
+testst: CFLAGS += $(TSAN)
+testst: all
+	@echo "Running tests with ThreadSanitizer..."
+	+make inttests
+	+make ctests
+
+inttests: all
+	./test.sh
+
+inttestsa: CFLAGS += $(ASAN)
+inttestsa: all
+	./test.sh
+
+inttestsub: CFLAGS += $(UBSAN)
+inttestsub: all
+	./test.sh
+
+inttestst: CFLAGS += $(TSAN)
+inttestst: all
+	./test.sh
+
+ctests: $(LIBFT) all
 	+make -C tests
 
 ctestsa: CFLAGS += $(ASAN)