I've been moving a large codebase to use unit and integration tests lately, and it's definitely saved me a lot of time compared to what I would spend on manual

I've been moving a large codebase to use unit and integration tests lately, and it's definitely saved me a lot of time compared to what I would spend on manual testing. And also, as a programmer I enjoy the process of writing and debugging tests much more than manual testing, so even if it wasn't a time saver, it would still make my job more enjoyable.