Csharp 如何使用FastEndpoints和.NET 8 WebAppliationBuilder进行集成测试

我有一个.NET 8最小API设置:

var builder = WebApplication.CreateBuilder(args);
var app = builder.ConfigureApp();
app.Run();

// Reference for Testing Purposes of FastEndpoints
namespace BeeHive.Api
{
    public abstract class Program;
}


public static WebApplication ConfigureApp(this WebApplicationBuilder builder)
{
    builder = builder
        .ConfigureConfiguration()
        .ConfigureLogging()
        .ConfigureSwagger()
        .ConfigureDatabase()
        .ConfigureApi();

    var app = builder.Build();

    app.UseSwaggerConfig()
        .UseApi()
        .UseDatabase();
    
    return app;
}

现在我使用FastEnpoints:

https://fast-endpoints.com/docs/integration-unit-testing#service-registration

这样，我就有了集成测试的简单设置:

public class PingPongEndpointTest(BeeHiveApiFixture app) : TestBase<BeeHiveApiFixture>
{
    [Fact]
    public async Task PingPongEndpoint_ExpectedBehaviour()
    {
        var (httpResponse, dataResponse) = await app.Client.POSTAsync<PingPongEndpoint, PingPongEndpointRequest, PingPongEndpointResponse>(
            new()
            {
                Text = "Test"
            });

        httpResponse.StatusCode.Should().Be(HttpStatusCode.OK);
        dataResponse.ReversedText.Should().Be("tseT");
    }
}

public class BeeHiveApiFixture : AppFixture<Program>
{
    protected override void ConfigureApp(IWebHostBuilder a)
    {
        // Doesnt overwrite the WebApplicationBuilder
    }
}

现在我的目标是现在使用我的配置数据库中的AddGbContent，因为这向真实的数据库显示，而我想用InMemory数据库覆盖它.

AppFixture中的正常情况我想覆盖此附件.但由于FastEndpoints和我的设置中的WebAppliationBuilder覆盖了IWebHostBuilder，因此这是不可覆盖的(这两个get都被调用了).

如何做到这一点？