call site 4 for test.collect.Directory.listchain
test/testing/test_config.py - line 372
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   def test__getcol_global_dir(self):
       x = self.tmpdir.ensure("a", dir=1)
       config = py.test.config._reparse([x])
       col = config._getcollector(x)
       assert isinstance(col, py.test.collect.Directory)
->     print col.listchain()
       assert col.name == 'a'
       assert col.parent is None
       assert col._config is config