The service layer can be the most practical place to write tests, because you aren't mocking a lot of random services (like you would with a controller) and you can focus on testing methods that do a single thing, if your services are well written.
If your test is more than 5-10 lines long, you are probably trying to do useless things like mock half the app and you should have a method that returns simple data / services that don't take a 1000 other services as dependencies.
TDD is only a good choice when you have a clearly defined problem and know how you solve it.
If your test is more than 5-10 lines long, you are probably trying to do useless things like mock half the app and you should have a method that returns simple data / services that don't take a 1000 other services as dependencies.
TDD is only a good choice when you have a clearly defined problem and know how you solve it.