public void AccessTokenRefreshTest()
{
var request = new Mock <HttpWebRequest>();
request.Setup(obj => obj.RequestUri).Returns(new Uri("https://demo.eduvpn.nl/portal/oauth.php/token"));
request.SetupSet(obj => obj.Method = "POST");
request.SetupProperty(obj => obj.Credentials);
request.SetupProperty(obj => obj.PreAuthenticate, false);
request.SetupSet(obj => obj.ContentType = "application/x-www-form-urlencoded");
request.SetupProperty(obj => obj.ContentLength);
var request_buffer = new byte[1048576];
request.Setup(obj => obj.GetRequestStream()).Returns(new MemoryStream(request_buffer, true));
var response = new Mock <HttpWebResponse>();
response.Setup(obj => obj.GetResponseStream()).Returns(new MemoryStream(Encoding.UTF8.GetBytes(Global.AccessTokenJSON)));
response.SetupGet(obj => obj.StatusCode).Returns(HttpStatusCode.OK);
request.Setup(obj => obj.GetResponse()).Returns(response.Object);
AccessToken
token1 = new BearerToken(Global.AccessTokenObj, DateTimeOffset.Now),
token2 = token1.RefreshToken(request.Object, new NetworkCredential("username", "password"));
var request_param = HttpUtility.ParseQueryString(Encoding.ASCII.GetString(request_buffer, 0, (int)request.Object.ContentLength));
Assert.AreEqual("refresh_token", request_param["grant_type"]);
Assert.IsNotNull(request_param["refresh_token"]);
Assert.IsTrue((token1.Scope == null) == (request_param["scope"] == null));
Assert.IsTrue(token1.Scope == null || token1.Scope.SetEquals(new HashSet <string>(request_param["scope"].Split(null))));
Assert.AreEqual(token1, token2);
Assert.IsTrue(token1.Authorized == token2.Authorized);
Assert.IsTrue((token1.Expires - token2.Expires).TotalSeconds < 60);
Assert.IsTrue((token1.Scope == null) == (token2.Scope == null));
Assert.IsTrue(token1.Scope == null || token1.Scope.SetEquals(token2.Scope));
}