call site 5 for test.collect.Module.listchain
test/testing/test_config.py - line 364
356
357
358
359
360
361
362
363
364
365
   def test__getcol_global_file(self):
       x = self.tmpdir.ensure("x.py")
       config = py.test.config._reparse([x])
       col = config._getcollector(x)
       assert isinstance(col, py.test.collect.Module)
       assert col.name == 'x.py'
       assert col.parent.name == self.tmpdir.basename 
       assert col.parent.parent is None
->     for col in col.listchain():
           assert col._config is config