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我正在将现有的 ASP.Net 5 Web 应用程序迁移到 ASP.Net 6，并遇到了通过集成测试的最后障碍。

我自定义 WebApplicationFactory 并抛出异常：Changing the host configuration using WebApplicationBuilder.WebHost is not supported. Use WebApplication.CreateBuilder(WebApplicationOptions) instead.

    public class CustomWebApplicationFactory<TStartup> : WebApplicationFactory<TStartup> where TStartup : class\n    {\n        protected override void ConfigureWebHost(IWebHostBuilder builder)\n        {\n            Environment.SetEnvironmentVariable("ASPNETCORE_ENVIRONMENT", "IntegrationTests");\n            builder.ConfigureServices(services => {\n                // Create a new service provider.\n                var serviceProvider = new ServiceCollection()\n                    .AddEntityFrameworkInMemoryDatabase().AddLogging()\n                    .BuildServiceProvider();\n\n                // Add a database context (AppDbContext) using an in-memory database for testing.\n                services.AddDbContextPool<AppDbContext>(options =>\n                {\n                    options.UseInMemoryDatabase("InMemoryAppDb");\n                    options.UseInternalServiceProvider(serviceProvider);\n                    options.EnableSensitiveDataLogging();\n                    options.EnableDetailedErrors();\n                    options.LogTo(Console.WriteLine);\n                });\n\n                services.AddDbContextPool<AppIdentityDbContext>(options …