WebApplicationFactory should enable ValidateScopes and ValidateOnBuild by default regardless of environment

Is there an existing issue for this?

[X] I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

In the context of WebApplicationFactory which is intended for testing, the service provider options ValidateScopes and ValidateOnBuild are not specifically set, and instead rely on the environment to be Development.

API Code: When run in dev mode this throws exception due to invalid DI setup.

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddSingleton<SingletonService>();
builder.Services.AddScoped<ScopedService>();

var app = builder.Build();

app.MapGet("/hello", () => "world");

app.Run();

public class SingletonService(ScopedService scoped) { }
public class ScopedService { }
public partial class Program { }

Test Code: E2E tests pass

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;

namespace TestProject;

public class UnitTest1
{
    [Fact]
    public async Task Hello()
    {
        var api = new TestApi();
        using var client = api.CreateClient();
        var response = await client.GetAsync("/hello");
        response.EnsureSuccessStatusCode();
        var responseContent = await response.Content.ReadAsStringAsync();
        Assert.Equal("world", responseContent);
    }
}

public class TestApi : WebApplicationFactory<Program>
{
    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.UseEnvironment("test"); // <-- In E2E test mode I want a different environment
    }
}

Describe the solution you'd like

The options ValidateScopes and ValidateOnBuild should be true by default when using WebApplicationFactory<TEntryPoint> which is designed for testing.

Additional context

This can easily be done manually via the following code. It's just unexpected that this isn't the default.

    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.UseEnvironment("test");
        builder.UseDefaultServiceProvider(options =>
        {
            options.ValidateScopes = true;
            options.ValidateOnBuild = true;
        });
    }

dotnet / aspnetcore