call site 3 for path.local.chdir
path/local/testing/test_local.py - line 140
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   def test_chdir(self):
       tmpdir = self.tmpdir.realpath()
       old = local()
       try:
->         res = tmpdir.chdir()
           assert str(res) == str(old)
           assert py.std.os.getcwd() == str(tmpdir)
       finally:
           old.chdir()