call site 7 for test.collect.Module.listchain
test/testing/test_config.py - line 386
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   def test__getcol_pkgfile(self):
       x = self.tmpdir.ensure("x.py")
       self.tmpdir.ensure("__init__.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 == x.dirpath().basename 
       assert col.parent.parent is None
->     for col in col.listchain():
           assert col._config is config