Custom namespace in Codeception tests, how to add?

Question

Codeception

Good day! There was a need to update codeception. When updating, there was a situation that it no longer finds the classes that are used - since it uses its own namespace and autoloader. That is, a test along the path: acceptance/conversation/add_cest.php - called Acceptance_Convertsation_Add_Cest. It does not find tests, but if you change the name of both the class and the file, everything will be ok. With this helper classes with a similar namepsace inside the test are called without problems. I can't figure out how to connect my own names to it