    # File lib/fog/aws/requests/auto_scaling/delete_notification_configuration.rb, line 39
            def delete_notification_configuration(auto_scaling_group_name, topic_arn)
              unless self.data[:notification_configurations].has_key?(auto_scaling_group_name)
                raise Fog::AWS::AutoScaling::ValidationError.new('AutoScalingGroup name not found - %s' % auto_scaling_group_name)
              end
              unless self.data[:notification_configurations][auto_scaling_group_name].has_key?(topic_arn)
                raise Fog::AWS::AutoScaling::ValidationError.new("Notification Topic '#{topic_arn}' doesn't exist for '#{self.data[:owner_id]}'")
              end

              self.data[:notification_configurations][auto_scaling_group_name].delete(topic_arn)
              if self.data[:notification_configurations][auto_scaling_group_name].empty?
                self.data[:notification_configurations].delete(auto_scaling_group_name)
              end

              response = Excon::Response.new
              response.status = 200
              response.body = {
                'ResponseMetadata' => { 'RequestId' => Fog::AWS::Mock.request_id }
              }
              response
            end