call site 18 for test.config.initsession
doc/example/pytest/test_failures.py - line 8
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   def test_failure_demo_fails_properly(): 
       config = py.test.config._reparse([failure_demo]) 
->     session = config.initsession()
       session.main()
       l = session.getitemoutcomepairs(Failed)
       assert len(l) == 21 
       l = session.getitemoutcomepairs(Passed)
       assert not l