Azure Functions test server for integration testing

[baharedankoyuncu]

Hi 👋

I hope I've come to the right repo.

Are there any plans to support a "Test Server" similar to the one in ASP.NET Core? I've read quite a few posts, most which are dated, on how to glue something together which doesn't work.

I was wondering if there are any plans to support this or if it's already a feature being tracked?

[dgvives]

Hello @baharedankoyuncu , Recently I've been able to run integration tests on Azure Functions using HostBuilder and, combined with testenvironment-docker package, now we have full integration tests running on CI/CD pipeline. Hope this sample code helps you as a guide

/// It is not possible to configure running ConfigureWebHost when running Azure Functions.
/// Following statements throw exception:
///     var host = new HostBuilder().ConfigureWebHost(x => x.UseStartup<Startup>());
///     var host = new HostBuilder().ConfigureWebHost(x => x.UseTestServer());

var startup = new Startup();

var builder = new HostBuilder()
    .ConfigureAppConfiguration((context, config) =>
    {
        config
            .AddInMemoryCollection(new[] {
                new KeyValuePair<string, string>("AzureWebJobsStorage", "UseDevelopmentStorage=true"),
                new KeyValuePair<string, string>("FUNCTIONS_WORKER_RUNTIME","dotnet"),
                [...]                
            })
            .AddEnvironmentVariables();
    })
    .ConfigureWebJobs(startup.Configure);

var host = builder.Build();
await host.StartAsync();

var function1 = new Function1(host.Services.GetRequiredService<ILogger<Function1>>(), 
                [...]  );

await function1.Run([...]);

[baharedankoyuncu]

Hi @dgvives, Interesting approach, however I've no experience with docker in regards to your setup. I have tried to simply spin up a ProcessStartInfo using the Azure Functions Tools and pointing to my function but this isn't elegant in anyway when considering a CI/CD pipeline. I was hoping there would be something similar to the TestServer in ASP.NET Core.

[dgvives]

You may succeed adding test server and webclient to hostbuilder, however I didn't manage to so instead of running http requests in webclient I just called function procedures, and it works.

Provided sample doesn't utilize docker

[baharedankoyuncu]

Thanks, I see and understand but I was hoping there would be something "official" and user friendly.

@apawast is there any input from MS on this?

[baharedankoyuncu]

Any updates on this?

[ArjenRev]

Integration testing support with TestServer for Azure Functions would be a huge improvement to get our testing strategy on par with regular ASP.NET Core Web API's.

[AbdulJabbaar]

Any update on this?