public void YoutubeClient_ParseUsername_Test(string userUrl, string expectedUsername)
        {
            var username = YoutubeClient.ParseUsername(userUrl);

            Assert.That(username, Is.EqualTo(expectedUsername));
        }
 public void YoutubeClient_ParseUsername_Invalid_Test(string userUrl)
 {
     Assert.Throws <FormatException>(() => YoutubeClient.ParseUsername(userUrl));
 }