call site 2 for path.svnwc.checkout
path/svn/testing/test_test_repo.py - line 18
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   def test_commit(self):
->     self.wc.checkout(self.repo)
       p = self.wc.join("a_file")
       p.write("test file")
       p.add()
       rev = self.wc.commit("some test")
       assert p.info().rev == 1
       assert rev == 1
       rev = self.wc.commit()
       assert rev is None