Btukfyl

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

{ }

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