docs: def require_condition(cls, expr, message, *format_args, **format_kwds):
          """
          used to assert a certain state. If the expression renders a false
          value, an exception will be raised with the supplied message
  
          :param: message:     The failure message to attach to the raised Buzz
          :param: expr:        A boolean value indicating an evaluated expression
          :param: format_args: Format arguments. Follows str.format convention
          :param: format_kwds: Format keyword args. Follows str.format convetion
          """
          if not expr:
              raise cls(message, *format_args, **format_kwds)