call site 6 for path.svnwc.new
path/testing/fscommon.py - line 76
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   def test_newext(self):
       newpath = self.root.join('samplefile.py')
->     newext = newpath.new(ext='.txt')
       assert newext.basename == "samplefile.txt"
       assert newext.purebasename == "samplefile"