call site 4 for test.collect.Directory.listchain
test/testing/test_config.py - line 353
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   def test_getcolitems_curdir_and_subdir(self):
       a = self.tmpdir.ensure("a", dir=1)
       config = py.test.config._reparse([self.tmpdir, a])
       colitems = config.getcolitems()
       assert len(colitems) == 2
       col1, col2 = colitems 
       assert col1.name == self.tmpdir.basename
       assert col2.name == 'a'
       for col in colitems:
->         for subcol in col.listchain():
               assert col._config is config