call site 1 for path.svnwc.ensure
path/svn/testing/test_wccommand.py - line 200
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   def test_ensure(self):
->     newpath = self.root.ensure('a', 'b', 'c')
       try:
           assert newpath.check(exists=1, versioned=1)
           newpath.write("hello")
           newpath.ensure()
           assert newpath.read() == "hello"
       finally:
           self.root.join('a').remove(force=1)