def test_collectonly(self): 

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

->                                datadir / 'filetest.py')

       assert session.config.option.collectonly

       out = self.file.getvalue()

       #print out 

       l = session.getitemoutcomepairs(Failed)

       #if l: 

       #    x = l[0][1].excinfo

       #    print x.exconly() 

       #    print x.traceback

       assert len(l) == 0 

       for line in ('filetest.py', 'test_one', 

                    'TestClass', 'test_method_one'): 

           assert out.find(line)