call site 3 for path.local.ensure
apigen/rest/testing/test_rest.py - line 138
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   def test_write_section(self):
->     tempdir = temppath.ensure('htmldirwriter', dir=1)
       hdw = self.get_filled_writer(HTMLDirWriter, HTMLHandler, HTMLHandler,
                                    tempdir)
       assert tempdir.join('foo.html').check(file=1)
       assert tempdir.join('bar.html').check(file=1)
       assert tempdir.join('foo.html').read().startswith('<html>')