code: def alwaysThrew(cls, spy, error_type=None): #pylint: disable=invalid-name
          
          cls.__is_spy(spy)
          if not (spy.alwaysThrew(error_type)):
              raise cls.failException(cls.message)
docs: Checking the inspector is always raised error_type
          Args: SinonSpy, Exception (defaut: None)