Plenty errors while doing Integration Tests

问题

I have been following this tutorial on Integration tests: https://code-maze.com/integration-testing-asp-net-core-mvc/

My classes look very similar to his. I will also leave the code here:

using Intersection;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Intersection.Models;
using Microsoft.Extensions.DependencyInjection;

namespace XUnitTestProject1
{
    public class TestingWebAppFactory<T> : WebApplicationFactory<Startup>
    {
        protected override void ConfigureWebHost(IWebHostBuilder builder)
        {
            builder.ConfigureServices(services =>
            {

                var descriptor = services.SingleOrDefault(
                  d => d.ServiceType ==
                     typeof(DbContextOptions<DbContext>));

                if (descriptor != null)
                {
                    services.Remove(descriptor);
                }

                var serviceProvider = new ServiceCollection()
                  .AddEntityFrameworkInMemoryDatabase()
                  .BuildServiceProvider();

                services.AddDbContext<DbContext>(options =>
                {
                    options.UseInMemoryDatabase("Intersection");
                    options.UseInternalServiceProvider(serviceProvider);
                });

                var sp = services.BuildServiceProvider();

                using (var scope = sp.CreateScope())
                {
                    using (var appContext = scope.ServiceProvider.GetRequiredService<DbContext>())
                    {
                        try
                        {
                            appContext.Database.EnsureCreated();
                        }
                        catch (Exception ex)
                        {
                            //Log errors or do anything you think it's needed
                            throw;
                        }
                    }
                }
            });
        }
    }
}


namespace XUnitTestProject1
{
    public class AdminControllerIntegrationTests : IClassFixture<TestingWebAppFactory<Startup>>
    {
        private readonly HttpClient _client;

        public AdminControllerIntegrationTests(TestingWebAppFactory<Startup> factory)
        {
            _client = factory.CreateClient();
        }

        [Fact]
        public async Task Index_WhenCalled_ReturnsApplicationForm()
        {
            var response = await _client.GetAsync("/Admin");

            response.EnsureSuccessStatusCode();

            var responseString = await response.Content.ReadAsStringAsync();

            Assert.Contains("John", responseString);
            Assert.Contains("Paul", responseString);
        }
    }
}

Everytime I ran some test, I got an error asking me to import different NuGet Packages.

But now I get a really weird error like:

System.TypeLoadException : Could not load type 'Microsoft.EntityFrameworkCore.Infrastructure.IDbContextOptionsExtensionWithDebugInfo' from assembly 'Microsoft.EntityFrameworkCore, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

on line

at Startup.b__4_1(DbContextOptionsBuilder options) in Startup.cs line: 46

Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Intersection.Data;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Intersection.Models;

namespace Intersection
{
public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        /*services.AddDbContext<ApplicationDbContext>(options =>
            options.UseSqlServer(
                Configuration.GetConnectionString("DefaultConnection")));*/
        /*services.AddDefaultIdentity<IdentityUser>()
            .AddDefaultUI(UIFramework.Bootstrap4)
            .AddEntityFrameworkStores<ApplicationDbContext>();*/

        services.AddDbContext<AppIdentityDbContext>(options => options.UseSqlServer(Configuration["ConnectionStrings:DefaultConnection"]));
        services.AddIdentity<AppUser, IdentityRole>().AddEntityFrameworkStores<AppIdentityDbContext>().AddDefaultTokenProviders();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseDatabaseErrorPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseAuthentication();

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        });
    }
}

}

What could be the issue here? Are my testing classes wrong?

来源：https://stackoverflow.com/questions/59652527/plenty-errors-while-doing-integration-tests