Error on UnitTest for Login Controller with token Bearer

I work with webapi and I added a test project to a webapi project. I managed my webapi with a login bearer token and every time I call an endpoint from swagger I get the username to compare then if it matches the information inside the token.

In my test project to get that user's token I go through the Login endpoint, but when I call it I get this error:

System.NullReferenceException: 'Reference to an object not set on an object instance.'

Here is the login test and the controller login:

Test login:

   [TestMethod]
    public void Test_Login_ReturnToken()
    {
        var controller = new Controllers.AccountController
        {
            Request = new HttpRequestMessage(),
            Configuration = new HttpConfiguration()
        };

        var response = controller.Login("abcde");

        Assert.IsNotNull(response);
        Assert.AreEqual(response.StatusCode, HttpStatusCode.OK);
    }

Controller Login:

        [HttpPost, Route("Login")]
    [AllowAnonymous]
    public HttpResponseMessage Login(string nomeUtente)
    {            
        GetLoginResponseModel responseLogin = new GetLoginResponseModel();

        var command = Utils.GetOracleCommand();

        command.CommandText = "SP_S_CODICE";

        OracleDataReader reader = command.ExecuteReader();



            var identity = new ClaimsIdentity(Startup.OAuthOptions.AuthenticationType);
            identity.AddClaim(new Claim(ClaimTypes.Name, nomeUtente));

            AuthenticationTicket ticket = new AuthenticationTicket(identity, new AuthenticationProperties());
            var currentUtc = new SystemClock().UtcNow;
            ticket.Properties.IssuedUtc = currentUtc;
            ticket.Properties.ExpiresUtc = currentUtc.Add(TimeSpan.FromMinutes(30));

            var token = Startup.OAuthOptions.AccessTokenFormat.Protect(ticket);


           ....

    }

I believe it is due to the fact of not having a startup within the test or wrong project?

It gives me error on this instruction

var identity = new ClaimsIdentity (Startup.OAuthOptions.AuthenticationType);                  identity.AddClaim (new Claim (ClaimTypes.Name, userName));

Thanks in advance!