recommendation for test(unit test, integration test, etc) base on features like modular or default test folder

[anwar907]

developer need to prepare for testing in our project because long term we don't know how big this features we can develop so to make sure developer prepare for this form start, but for practice about testing is there we prepare our folder testing include in features or we follow folder defaults when we created first project, I mean this example just in Flutter project but I don't know in other tech implement folder defaults for testing, so nice to have knowledge about this for make sure current features don't disturb to new features integrated and then we have clean architectural about this testing. 👍

example default folder test: