.NET Core TestServer returning 404 when using Startup class defined in unit test project

Question

I've a basic .net core api web app and a unit test project that uses a TestServer to make http requests.

I've a TestStartup class that subclassed the Startup class in the api project.

If the Startup class is in the unit test project i get a 404 response. If the TestStartup class is moved to the api project i get a 200 reponse.

Api Project

Api.csproj

<PackageReference Include="Microsoft.AspNetCore.App" />

Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>();
}

Startup.cs

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvcCore();
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        app.UseMvc();
    }
}

TestController.cs

public class TestController : ControllerBase
{
    [HttpGet("test")]
    public ObjectResult Get()
    {
        return Ok("data");
    }
}

Unit Test Project

Tests.csproj

<PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.1" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="2.1.2" />
<PackageReference Include="Microsoft.AspNetCore.TestHost" Version="2.1.1" />
<PackageReference Include="Microsoft.Extensions.PlatformAbstractions" Version="1.1.0" />
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.8.0" />
<PackageReference Include="NUnit" Version="3.10.1" />
<PackageReference Include="NUnit3TestAdapter" Version="3.10.0" />

Tests.cs

[TestFixture]
public class Tests
{
    [Test]
    public async Task Test()
    {
        var server = new TestServer(WebHost.CreateDefaultBuilder()
            .UseStartup<TestStartup>()
            .UseEnvironment("Development"));

        var response = await server.CreateClient().GetAsync("test");
    }
}

Startup.cs

public class TestStartup : Startup
{ }

I have just asked this question: stackoverflow.com/questions/53681935/… (before seeing yours). Did you find an answer? Could you answer my question? Thanks — w0051977
– w0051977, Commented Dec 8, 2018 at 15:00
I didn't find an answer. I rebuilt it from scratch and it worked. As far as I was concerned the implementations were exactly the same - one worked - the other didn't. There must have been something different - couldn't see what though. — Dan
– Dan, Commented Feb 19, 2019 at 12:17
not sure if this is the fix github.com/aspnet/AspNetCore/issues/4332 — Dan
– Dan, Commented May 30, 2019 at 13:10

Zabavsky · Accepted Answer · 2019-12-10 15:19:37Z

59

In case someone experiences this targeting ASP.NET Core 3.0 or 3.1, don't forget to change the test project SDK to Microsoft.NET.Sdk.Web, i.e.

<Project Sdk="Microsoft.NET.Sdk.Web">

as per Test app prerequisites.

edited Dec 10, 2019 at 15:19

answered Nov 21, 2019 at 7:30

Zabavsky

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4 Comments

swedish_junior_dev Over a year ago

Im having this exakt problem with net core 3.1 and I only have 'Microsoft.NET.Test.Sdk' in my test project. I searched in Nuget for 'Microsoft.NET.Sdk.Web' but couldnt find it? How am I supposed to change the sdk?

Kokos Over a year ago

No, you just need to edit the *.csproj file and change the first line there: from: <Project Sdk="Microsoft.NET.Sdk"> to: <Project Sdk="Microsoft.NET.Sdk.Web"> And then magic will happen ;)

jolySoft Over a year ago

This is like gold, no more like hens teeth. Many thanks

Redplane Over a year ago

Nice answer, it saved my day

Edward · Accepted Answer · 2018-11-26 06:25:47Z

13

You could try two options below:

Add AddApplicationPart to Startup.cs

namespace IntegrationTestMVC
{
public class Startup
{         

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {   
       services.AddMvc().AddApplicationPart(Assembly.Load(new AssemblyName("IntegrationTestMVC"))); //"IntegrationTestMVC" is your original project name
    }

Try to convert TestFixture to IClassFixture

    public class IntegrationTestMVCUnitTest : IClassFixture<WebApplicationFactory<TestStartup>>
{
    private readonly HttpClient _client;
    private readonly WebApplicationFactory<TestStartup> _factory;

    public IntegrationTestMVCUnitTest(WebApplicationFactory<TestStartup> factory)
    {

        _factory = factory;
        _client = factory.CreateClient();
    }

    [Fact]
    public async Task IndexRendersCorrectTitle()
    {
        var response = await _client.GetAsync(@"/test");
    }

}

For the second option, you could refer Integration tests in ASP.NET Core

answered Nov 26, 2018 at 6:25

Edward

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3 Comments

reZach Over a year ago

Was this the solution to the original question?

Chamika Sandamal Over a year ago

services.AddMvc().AddApplicationPart(typeof(Startup).Assembly)

Vlado Pandžić Over a year ago

What if dont use AddMvc?

Mathew · Accepted Answer · 2019-08-29 06:06:09Z

6

Adding a reference to Microsoft.AspNetCore.Mvc.Testing to the project file containing the test, as per the instructions in aspnetcore-2.2#test-app-prerequisities fixed the issue for me.

answered Aug 29, 2019 at 6:06

Mathew

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Comments

Guilherme Muniz · Accepted Answer · 2021-03-17 13:56:33Z

0

I had to update my nuget packages in test project to work

answered Mar 17, 2021 at 13:56

Guilherme Muniz

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