updated makefile for testing

travail_pratique/vec2/Makefile

@@ -11,5 +11,9 @@ main.o: main.c
 vec2.o: vec2.c vec2.h
 	$(CC) $(OPTS) -c $^
 
+test:
+	make -C tests test
+
 clean:
-	rm -f *.o main
\ No newline at end of file
+	rm -f *.o main
+	make -C tests clean