call site 19 for test.config.initsession
test/testing/test_session.py - line 46
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   def runfiletest(opts):
       config = py.test.config._reparse(opts + [datadir/'filetest.py']) 
->     session = config.initsession()
       session.main()
       l = session.getitemoutcomepairs(Failed)
       assert len(l) == 2 
       l = session.getitemoutcomepairs(Passed)
       assert not l