public void MediaServicesCredentialsTestGetToken()
{
MediaServicesCredentials target = WindowsAzureMediaServicesTestConfiguration.CreateMediaServicesCredentials();
Assert.IsNull(target.AccessToken);
Assert.IsTrue(target.TokenExpiration < DateTime.UtcNow);
target.RefreshToken();
Assert.IsNotNull(target.AccessToken);
Assert.IsTrue(target.AccessToken.Length > 0);
Assert.IsTrue(target.TokenExpiration > DateTime.UtcNow.AddHours(1));
var token = target.GetAccessToken();
Assert.AreEqual( target.AccessToken, token.Item1);
Assert.AreEqual(target.TokenExpiration, token.Item2);
}