added stack and test file

makefile

@@ -35,15 +35,28 @@ $(program_obj_filesobj_files): %.o: %.c
 # --------------------------
 # Unit Tests
 # --------------------------
-unitTests:
-	echo "needs to be implemented"
+tets_sources = test_stack.c stack.c
+test_objects = $(test_sources:.c=.o)
+
+test_runner: $(test_objects)
+	$(CC) $(FLAGS) $^ -o $@
+
+unitTests: test_runner
+	@echo "============================="
+	@echo "Running Stack Unit Tests..."
+	@echo "============================="
+	./test_runner
+	@echo "============================="
+	@echo "Stack Unit Tests Finished."
+	@echo "============================="
+
 
 # --------------------------
 # Clean
 # --------------------------
 clean:
 ifeq ($(OS),Windows_NT)
-	del /f *.o doble
+	del /f *.o doble test_runner
 else
-	rm -f *.o doble
+	rm -f *.o doble test_runner
 endif