When to use Unit Testing?

Almost simultaneously I came across Unit Testing in the book "Clean Code" and in a tutorial from Unity3D.college:

I've been doing tons of Unity tutorials yet never heard this being mentioned. I assume this is because a tutorial is not a live and flexible project but more like a presentation of finished code. So my question is how common is it to use Unit Testing when developing a game in Unity? I assume scope plays an important role but same could be said for keeping code clean and the above mentioned book tells me that there is absolutely no excuse for bad habits.
I also read in a blog post (c# but not Unity) that writing a Unit Test can sometimes make you spot badly designed code. All that plus the fact that Unit Testing would have come in handy many times in the past makes me believe I should use it from now on in every project.

Any thoughts from you more experienced folks on that?

Thanks!

 

Game developers are years behind corp devs sadly so its not very common. We do it, but we have background in corp dev

 

- when you're working on public facing API
- you're working on public asset
- you have a lot of time and you don't now how to do automated feature tests instead

 

Scenario tests / spec tests does not replace unit testing, two different things

 

Oh really? I wouldn't know that if you don't enlighten me. LOL

 

It feels like this thread is a can of worms waiting to be spilled

For starters, I'm not sure there even is a general consensus on what exactly a "unit" is. A single function? An entire class (i.e. an object)? A module?

Either way, I wouldn't stress over semantics. In fact, I believe it's exactly these kind of worries that make people obsess over what should go into unit testing and what shouldn't, and that ends up costing too much time, so they end up avoiding it altogether. And well, if you don't test your code, that's a bad habit in itself

 

Our game is so complex so doing scenario testing is basicly impossible . We do mostly unit testing on the domain and the network API (in-house networking api ) and the like