that's fine, Nim repo uses a lot of `unittest.check` in tests running with testament. <https://github.com/nim-lang/Nim/blob/47c078e29c7e459e8b413dcc0020637e6e042c44/tests/stdlib/ttimes.nim#L472>
only `unittest.suite` and `unittest.test` are not recommended to use. <https://nim-lang.github.io/Nim/contributing.html#writing-tests-stdlib>