call site 5 for test.collect.Directory.listchain
test/testing/test_config.py - line 333
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   def test_getcolitems_onedir(self):
       config = py.test.config._reparse([self.tmpdir])
       colitems = config.getcolitems()
       assert len(colitems) == 1
       col = colitems[0]
       assert isinstance(col, py.test.collect.Directory)
->     for col in col.listchain():
           assert col._config is config