Identityserver4: Using Microsoft.AspNetCore.TestHost.TestServer

[joshmouch]

Do you have any examples or pointers on how to get IdentityServer4 and TestServer to work well together? Here's my attempt.

I have an ASP.Net Core project that hosts both MVC and IdentityServer4.
I also have an xunit integration test that uses Microsoft.AspNetCore.TestHost.TestServer to call an MVC action. In the constructor of this test, I'm setting up the HttpClient, and I need to perform the handshake with IdentityServer4 to get a bearer token. However, I'm not having much luck.

Since TestServer creates its own instance of HttpClient, I had to create a new version of IdentityServer4's TestDiscoveryClient which accepts an HttpClient. And this is my resulting code:

`

public class ControllerTests
{
    private TestServer _server;
    private HttpClient _client;

    public ControllerTests()
    {
        // Arrange
        var contentRoot = Path.Combine(Directory.GetCurrentDirectory(), @"..\..\..\..\..\..\src\MyApi");
        _server = new TestServer(new WebHostBuilder()
            .UseContentRoot(contentRoot)
            //.UseWebRoot(Path.Combine(Directory.GetCurrentDirectory(), "wwwroot"))
            .UseStartup<Startup>()
            );

        _client = _server.CreateClient();

        // discover endpoints from metadata
        var disco = TestDiscoveryClient.GetAsync(_client).Result;
        if (disco.IsError)
        {
            throw new Exception(disco.Error);
        }

        // request token
        var tokenClient = new TokenClient(disco.TokenEndpoint, "client", "secret");
        var tokenResponse = tokenClient.RequestClientCredentialsAsync("api1").Result;

        if (tokenResponse.IsError)
        {
// ********* THROWS EXCEPTION HERE.  Error is "Not Found".
            throw new Exception(tokenResponse.Error);
        }

        _client.SetBearerToken(tokenResponse.AccessToken);
    }

    [Fact]
    public async Task Controller_Test1() // Naming convention  <Feature>_<Action>_<State>_<FailureOrSuccess>
    {
        var response = await _client.PostAsJsonAsync("/api/Test");
        response.EnsureSuccessStatusCode();

        var responseString = await response.Content.ReadAsStringAsync();

        // Assert
        Assert.Equal("true", responseString);
    }

}

`

This code gets throws an exception because I get a "Not Found" response back from IdentityServer4. I've marked in the code where the exception occurs.

[joshmouch]

Actually, writing this out helped me figure it out. The key was to use _server.CreateHandler() to create an HttpMessageHandler to pass to both the DiscovertClient constructor and the TokenClient constructor. That means you can't use the DiscoveryClient.GetAsync static method, though.

[lock[bot]]

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