added test to clean

Makefile

@@ -11,8 +11,9 @@ test: $(NAME)_test.o $(NAME).o
 	./test
 
 $(NAME).o: $(NAME).h
+$(NAME)_test.o: $(NAME).h
 
 .PHONY: clean
 
 clean:
-	rm -f *.o $(NAME) tests
+	rm -f *.o $(NAME) test