call site 1 for path.svnurl.ensure
path/svn/testing/test_urlcommand.py - line 18
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   def test_move_file(self):  # overrides base class
->     p = self.root.ensure('origfile')
       newp = p.dirpath('newfile')
       p.move(newp)
       assert newp.check(file=1)
       newp.remove()
       assert not p.check()