public void GivenRobotsWithNoSitemap_ThenRobotsDoesNotContainSitemapsEvent()
        {
            var invalidRobotsUrl = Given.A.Robots.WithNoSitemaps.Url;
            var invalidHttpMessageHandlerFactory = Given.A.Robots.WithNoSitemaps.HttpMessageHandler;

            var robots = new Robots(
                invalidRobotsUrl,
                invalidHttpMessageHandlerFactory
                );

            var invalidRobotsFile = Record.Exception(() => robots.GeneratePerformanceReport());

            invalidRobotsFile.Should().BeOfType <RobotsDoesNotContainSitemaps>();
        }