def test_exit_first_problem(self): 

       session = self.mainsession("--exitfirst", 

->                                datadir / 'filetest.py')

       assert session.config.option.exitfirst

       l = session.getitemoutcomepairs(Failed)

       assert len(l) == 1 

       l = session.getitemoutcomepairs(Passed)

       assert not l