In some discussions people give tests with the precise test number, but I couldn't find tests of any exercices in main site and in problem exposition, so my question is:
Where can I find timus' tests?
Are there in some place or people got them in other ways?

Thank in advance.

People who give tests don't surely know their numbers. The scheme is as follows:

We write our solution on some problem, submit it and for example get verdict "Wrong Answer 5". Then we try to test our solution on tests, which we generate "at home". If we find such test on which our solution gives wrong answer, we fix mistake in program and submit it again. If new verdict is "Accepted" or for example "Wrong Answer 8", we will understand that Test 5 could be the same or similar like our.

Thanks a lot, I've finally understood how it works.