ASP .NET Core：自定义WebApplicationFactory并使用WithWebHostBuilder自定义客户端

如何解决ASP .NET Core：自定义WebApplicationFactory并使用WithWebHostBuilder自定义客户端

我正在以这种方式自定义WebApplicationFactory以覆盖SQLServer中的数据库（我希望数据库位于内存中）：

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并且我使用WebHostBuilderExtensions重置数据库（确保所有测试数据库均为默认状态）：

public class CustomWebApplicationFactory<TStartup> : WebApplicationFactory<TStartup> where TStartup : class
{
    private readonly InMemoryDatabaseRoot _dbRoot = new InMemoryDatabaseRoot();

    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureTestServices(services =>
        {
            var descriptor = services.SingleOrDefault(d => d.ServiceType == typeof(DbContextOptions<TestContext>));

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

            services.AddDbContext<TestContext>(options =>
            {
                options.UseInMemoryDatabase("InMemoryDbForTesting",_dbRoot);
            });

            var sp = services.BuildServiceProvider();

            using (var scope = sp.CreateScope())
            {
                var scopedServices = scope.ServiceProvider;
                var db = scopedServices.GetRequiredService<TestContext>();
                var logger = scopedServices.GetRequiredService<ILogger<CustomWebApplicationFactory<TStartup>>>();

                db.Database.EnsureCreated();

                try
                {
                    DatabaseHelper.InitialiseDbForTests(db);
                }
                catch (Exception ex)
                {
                    logger.LogError(ex,$"An error occured seeding the database with test data. Error: {ex.Message}");
                }
            }
        });
    }
}

测试是：

public static class WebHostBuilderExtensions
{
    public static IWebHostBuilder ConfigureTestDatabase(this IWebHostBuilder builder,Action<TestContext> configure)
    {
        return builder.ConfigureTestServices(services =>
        {
            var sp = services.BuildServiceProvider();
            using var scope = sp.CreateScope();
            var scopedServices = scope.ServiceProvider;
            var db = scopedServices.GetRequiredService<TestContext>();
            var logger = scopedServices.GetRequiredService<ILogger<TestControllerTests>>();

            try
            {
                configure(db);
            }
            catch (Exception ex)
            {
                logger.LogError(ex,$"An error occured setting up the database for the test. Error: {ex.Message}");
            }
        });
    }
}

    public static HttpClient CreateClientAndDbSetup(this WebApplicationFactory<Startup> factory,Action<TestContext> configure,string token)
    {
        var client = factory.WithWebHostBuilder(builder =>
        {
            builder.ConfigureTestDatabase(configure);
        }).CreateClient();

        return client;
    }

程序：

    [Fact]
    public async Task Get_ShouldReturnOk()
    {
        var client = _factory.CreateClientAndDbSetup(db => DatabaseHelper.RestetDbForTests(db),_token);
        
        var response = await client.GetAsync($"{_endPoint}");
        Assert.Equal(HttpStatusCode.OK,response.StatusCode);
    }

基于https://docs.microsoft.com/en-us/aspnet/core/test/integration-tests?view=aspnetcore-3.1

的代码

问题在于，对于所有测试，在初始化数据库之前正在执行将数据库还原到原始状态的操作。这意味着首先要从 WebHostBuilderExtensions 执行 ConfigureTestDatabase ，而不是从 CustomWebApplicationFactory 执行 ConfigureWebHost ，所以在第一次测试中可能是原始sql数据库将被重置。

CustomWebApplicationFactoru中的ConfigureWebHost方法应该对所有测试执行一次还是对每个测试执行？

有解决此问题的主意吗？