call site 7 for test.config.get_collector_trail
test/testing/test_config.py - line 395
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   def test_get_collector_trail_and_back(self):
       a = self.tmpdir.ensure("a", dir=1)
       self.tmpdir.ensure("a", "__init__.py")
       x = self.tmpdir.ensure("a", "trail.py")
       config = py.test.config._reparse([x])
       col = config._getcollector(x)
->     trail = config.get_collector_trail(col)
       assert len(trail) == 2
       assert trail[0] == a.relto(config.topdir)
       assert trail[1] == ('trail.py',)
       col2 = config._getcollector(trail)
       assert col2.listnames() == col.listnames()