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));
}