NPinFramework/test/NPin.Test/NPinTestWebBase.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Hosting;

namespace NPin.Test;

public class NPinTestWebBase : NPinTestBase
{
    public HttpContext HttpContext { get; private set; }

    public NPinTestWebBase() : base()
    {
        var httpContext = DefaultHttpContextAccessor.CurrentHttpContext;
        ConfigureHttpContext(httpContext);
        HttpContext = httpContext;

        var app = new ApplicationBuilder(ServiceProvider);
        var httpDelegate = app.Build();
        httpDelegate.Invoke(httpContext);
    }

    public override void ConfigureServices(HostBuilderContext host, IServiceCollection service)
    {
        service.Replace(new ServiceDescriptor(typeof(IHttpContextAccessor), typeof(DefaultHttpContextAccessor),
            ServiceLifetime.Singleton));
        base.ConfigureServices(host, service);
    }

    protected virtual void ConfigureHttpContext(HttpContext httpContext)
    {
        httpContext.Request.Path = "/test";
    }
}

internal class DefaultHttpContextAccessor : IHttpContextAccessor
{
    internal static HttpContext? CurrentHttpContext { get; set; } = new DefaultHttpContext();

    public HttpContext? HttpContext
    {
        get => CurrentHttpContext;
        set => throw new NotImplementedException();
    }
}