Negotiate authentication and Microsoft.AspNetCore.Mvc.Testing

Question

learn.microsoft.com recommends to use Microsoft.AspNetCore.Mvc.Testing for integration tests and it seems to be a great choice, but it seems that they missed to add the ability to test with NegotiateDefaults.AuthenticationScheme.

Adding to Startup.cs/ConfigureServices

 services.AddAuthentication (NegotiateDefaults.AuthenticationScheme).AddNegotiate ();

causes the tests to fail with

Message: System.NotSupportedException : Negotiate authentication requires a server that supports IConnectionItemsFeature like Kestrel.

Does anybody know how to use Microsoft.AspNetCore.Mvc.Testing with endpoints that use NegotiateDefaults.AuthenticationScheme? Is it just not supported, like the exception claims?

Answer 1

That is not supported by design

WebApplicationFactory doesn't use kestrel, it uses the in-memory TestServer and in-memory HttpClient. Neither of those support the features needed for Negotiate auth.

I dropped Microsoft.AspNetCore.Mvc.Testing and used a custom NUnit base class instead:

public class AspNetCoreIntegrationTestBase
{
  public CancellationTokenSource? CancellationTokenSource { get; set; }

  public Task? TestWebserver { get; set; }

  [OneTimeSetUp]
  public void Setup()
  {
    CancellationTokenSource = new CancellationTokenSource();
    TestWebserver = Program.CreateHostBuilder(Array.Empty<string>()).Build().StartAsync(CancellationTokenSource.Token);
  }

  [OneTimeTearDown]
  public void CleanUp()
  {
    CancellationTokenSource?.Cancel();
    TestWebserver?.Dispose();
  }
}

The httpclient to use needs to be initialized with

UseDefaultCredentials = true