call site 15 for path.svnwc.join
path/svn/testing/test_wccommand.py - line 42
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   def test_status_added(self):
->     nf = self.root.join('newfile')
       nf.write('hello')
       nf.add()
       try:
           s = nf.status()
           assert s.added
           assert not s.modified
           assert not s.prop_modified
       finally:
           nf.revert()