Separate Program.cs to Startup.cs in ASP.NET WebAPI Minimal for Integration testing

Question

I am trying to write integration tests for my web service.

I want to separate Program.cs into Startup.cs so test class can mock TestStartup.cs(or something like so). The point is swapping real services with mock services.

Attempt to use Startup.cs file for MinimalApi resulting app not compilable:

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory) {
    (...)
    // Error CS1929  'IApplicationBuilder' does not contain a definition for
    // 'MapGroup' and the best extension method overload 'EndpointRouteBuilderExtensions.MapGroup(IEndpointRouteBuilder, string)'
    // requires a receiver of type 'Microsoft.AspNetCore.Routing.IEndpointRouteBuilder'
    app.MapGroup("/product").MapProductApi().WithTags("Product");
    app.UseResponseCaching();
    app.UseOutputCache();
}

Am I going the right direction? Should Minimal Apis be used with Startup.cs?

Guru Stron · Accepted Answer · 2023-03-08 07:30:50Z

3

You can reconfigure the services with the usual test setup (see this answer for more details):

var application = new WebApplicationFactory<Program>()
    .WithWebHostBuilder(builder =>
    {
        builder.ConfigureServices(services =>
        {
            // set up servises
            services.RemoveAll(typeof(RegisteredServiceTypeToReplace));
            // add new registration for RegisteredServiceTypeToReplace
        });
    });

As for :

// Error CS1929 'IApplicationBuilder' does not contain a definition for 'MapGroup'...

You can try using UseEndpoints:

app.UseEndpoints(routeBuilder =>
{
    routeBuilder.MapGroup(...);
    // ...
})

edited Mar 8, 2023 at 7:30

answered Mar 8, 2023 at 7:21

Guru Stron

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4 Comments

MarwaAhmad Over a year ago

What if we we don't want to rely on ASPNet.MVC library? is there another class to inject Program into it?

Guru Stron Over a year ago

@MarwaAhmad "What if we we don't want to rely on ASPNet.MVC library" - can you please elaborate?

MarwaAhmad Over a year ago

Guru Stron: The WebApplicationFactory exists in ASPNET.MVC library, and we don't want to use it, we want to use what exist in ASPNetCore and Azure.Function only.

Guru Stron Over a year ago

@MarwaAhmad still not sure why. The class I've used comes from Microsoft.AspNetCore.Mvc.Testing, not ASPNET.MVC library. And I don't see any issues using it in test project.

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