code: def run(self) -> None:
          '''Calls sibling with exception expectation.'''
  
          with self.context.assertRaises(self.error.__class__) as error:
              super().run()
  
          self.exception = error.exceptiof run(self) -> None:
          '''Calls sibling with exception expectation.'''
  
          with self.context.assertRaises(self.error.__class__) as error:
              super().run()
  
          self.exception = error.exception
docs: Calls sibling with exception expectation.