Hello! And what could you suggest, if I need to use in parametrization a fixture, which returns unpredictable number of values? Of course, we could use it in parametrization as a regular Python function, but what if it's impossible? For example, this question is discussed here, but no solution was found: https://github.com/pytest-dev/pytest/issues/349 In my case, I definitely need a fixture and not a regular function, because parametrized value depends on HTTP service response. Here is example code which matches my case: https://pastebin.com/gLn1CrAa Of course, it doesn't work, because I'm trying to use fixture directly in mark.parametrize. Maybe, there is some suitable solution?