call site 14 for path.local.read
apigen/testing/test_apigen_example.py - line 191
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   def test_build_class_pages_instance(self):
       self.apb.build_class_pages(['main.SomeClass',
                                   'main.SomeSubClass',
                                   'main.SomeInstance'])
       clsfile = self.base.join('api/main.SomeInstance.html')
       assert clsfile.check()
->     html = clsfile.read()
       print html
       run_string_sequence_test(html, [
           'instance of SomeClass()',
       ])