gRPC integration test `TStartup` = `Program.cs` throws `"A public method named 'ConfigureIntegrationTests' or 'Configure' could not be found in the 'Program' type."`

[khteh]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the bug

I follow this: https://learn.microsoft.com/en-us/aspnet/core/grpc/test-services?view=aspnetcore-6.0 and bump into:

"A public method named 'ConfigureIntegrationTests' or 'Configure' could not be found in the 'Program' type."

at Microsoft.AspNetCore.Hosting.StartupLoader.FindMethod(Type startupType, String methodName, String environmentName, Type returnType, Boolean required)
   at Microsoft.AspNetCore.Hosting.StartupLoader.FindConfigureDelegate(Type startupType, String environmentName)
   at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.UseStartup(Type startupType, HostBuilderContext context, IServiceCollection services, Object instance)
   at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass13_0.<UseStartup>b__0(HostBuilderContext context, IServiceCollection services)
   at Microsoft.Extensions.Hosting.HostBuilder.CreateServiceProvider()
   at Microsoft.Extensions.Hosting.HostBuilder.Build()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostBuilderExtensions.<StartAsync>d__1.MoveNext()
   at Microsoft.Extensions.Hosting.HostingAbstractionsHostBuilderExtensions.Start(IHostBuilder hostBuilder)
   at Web.Api.IntegrationTests.Services.GrpcTestFixture`1.EnsureServer() in C:\\Projects\\ASP.Net\\AspNetCoreWebApi\\test\\Web.Api.IntegrationTests\\Services\\GrpcTestFixture.cs:line 115

The server is configured to listen at https://localhost:5000. This happens when I use the default TestServer.CreateHandler().

---

Does .Net Core 6 GRPC support HTTP/3? I configure HttpHandler with the following class:

public class Http3Handler : DelegatingHandler
{
    public Http3Handler() { }
    public Http3Handler(HttpMessageHandler innerHandler) : base(innerHandler) { }
    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        request.Version = HttpVersion.Version30;
        request.VersionPolicy = HttpVersionPolicy.RequestVersionExact;
       return await base.SendAsync(request, cancellationToken); // throws exception here
    }
}

and assign it:

    HttpHandler = new Http3Handler(Fixture.Handler)

and bump into the same error and exception shown above.

Expected Behavior

No response

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

6.0.402

Anything else?

Windows 11, Visual Studio 2022 17.3.6

[rafikiassumani-msft]

@khteh the sample code only supports Startup.cs and not Program.cs. We may add support for Program.cs in the future.

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[khteh]

Isn't the sample code built for .Net 6 and the date of the article is "06/04/2022"?

[khteh]

Hello!!! Wasn't startup.cs removed in .Net 6 with minimal hosting model? How long should we wait to do integration tests on gRPC services!?!

[JamesNK]

It isn't removed. Both options are supported. If you need it then you should choose it over WebApplicationBuilder.

[davidfowl]

Do we have a doc on how to test with the minimal hosting model?

[kwaclaw]

I am also interested to see how I can test when I don't have a startup class in the gRPC server, but a Program.cs with only top level statements. It seems it is possible for MVC using the WebApplicationFactory.

I tested this for my gRPC test project and found it worked for me:

• Added reference to Microsoft.AspNetCore.Mvc.Testing to xUnit test project.
• Added a public partial class Program { } to the end of Program.cs in the gRPC service project.
• Put this code into the constructor of my xUnit test fixture:

      _appFactory = new WebApplicationFactory<Program>()
          .WithWebHostBuilder(builder =>
          {
              builder.ConfigureServices(services =>
              {
                  services.AddSingleton<ILoggerFactory>(LoggerFactory);
              });
          });

• Created channel like this in test:

     _channel = GrpcChannel.ForAddress("http://localhost", new GrpcChannelOptions
      {
          LoggerFactory = _fixture.LoggerFactory,
          HttpHandler = _fixture.AppFactory.Server.CreateHandler()
      });

• Created the gRPC client as usual with _channel as argument.

[khteh]

Any update on this?

[jakoss]

Do we have a doc on how to test with the minimal hosting model?

I don't believe so, it would be very useful