Why doesn't Pycharm see tests from the same file?

Question

PyCharm

Hello.
There is a project on Django - I made a shared folder for tests and created 5 files there.
As a result, it turns out that 4 files are launched correctly, and 5 do not see tests at startup. And if you poke tests from this file with pens, then everything works.
Screenshot of the situation: take.ms/3izTY
What could be the problem?

Answer 1

Shouldn't the method start with test_ ?
Ps read PEP8.