Do you need logs for tests?

Question

.NET

Can you please tell me if writing logs (Log4net) is used in practice for automated tests?

Answer 1

Well, no one bothers to implement logs in tests, say for debugging. BUT!!! according to practice, tests should test one functionality, i.e. and asserts should only be directed at the object being tested.
If somewhere an additional check is needed at the time of data preparation, then asserts also help.