call site 2 for path.svnwc.propdel
path/svn/testing/test_wccommand.py - line 206
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   def test_proplist_recursive(self):
       s = self.root.join('samplefile')
       s.propset('gugu', 'that')
       try:
           p = self.root.proplist(rec=1)
           # Comparing just the file names, because paths are unpredictable
           # on Windows. (long vs. 8.3 paths)
           assert (self.root / 'samplefile').basename in [item.basename 
                                                               for item in p]
       finally:
->         s.propdel('gugu')