def method(method_name)
      new_method = super
      parameters = new_method.parameters
      if parameters.size >= 1 && parameters.last.last == :mock_method
        self.class.instance_method(method_name).bind(self)
      else
        new_method
      end
    end
def method(method_name)
      new_method = super
      parameters = new_method.parameters
      if parameters.size >= 1 && parameters.last.last == :mock_method
        self.class.instance_method(method_name).bind(self)
      else
        new_method
      end
    end
returns the original class method if the current method is a mock_method
 @param method_name [Symbol, String]
 @return [Method]