title: Pytest: customize test discovery through command line
body: <p>There are ways to configure pytest test discovery through <a href="https://doc.pytest.org/en/latest/example/pythoncollection.html#changing-naming-conventions" rel="nofollow noreferrer">configuration file </a>.</p>
  <p>I wonder if there are ways to configure pytest test discovery through command line options/args. In other words, can  I just pass some argument/switch to pytest command to achieve this?</p>