Asp.net核心集成测试中的依赖注入

我在单元测试项目中使用Moq成功注入了依赖项 . 但是对于集成测试，我想与数据库进行交互 . 所以我敢于伪造存储库/依赖项 . 我在为集成测试引入的单独类库中遇到了如何实现这样的问题 .

我想做这样的事情（数据应该来自数据库）：

public class CountryServiceIntegrationTest
{

    private ICountryService countryService;

    public CountryServiceIntegrationTest(ICountryService _countryService)
    {
        countryService = _countryService;                     
    }

    #endregion


    [Fact]
    public void Should_Return_ListOf_Countries()
    {
        //Act
        var myList = countryService.GetList("A");
        //Assert
        Assert.True(myList.Count > 0);
    }        
}

My CountryService Class:

public class CountryService : ICountryService
{
    // Note: Have to use Core.Domain.Country because of the namespace has Quantum.Service.Country
    protected IRepository<Core.Domain.Country> _countryRepository;
    protected IRepository<Core.Domain.State> _stateRepository;
    protected IRepository<Core.Domain.City> _cityRepository;

    public CountryService(IRepository<Core.Domain.Country> countryRepository, IRepository<Core.Domain.State> stateRepository, IRepository<Core.Domain.City> cityRepository)
    {
        _countryRepository = countryRepository;
        _stateRepository = stateRepository;
        _cityRepository = cityRepository;
    }


    public IList<CountryViewModel> GetList(string name)
    {
        var query = _countryRepository.Table.AsQueryable();
        if (string.IsNullOrEmpty(name) == false)
        {
            query = query.Where(i => i.CountryName.StartsWith(name));
        }
        return query.Select(i => new CountryViewModel()
        {
            CountryCode = i.CountryCode,
            CountryName = i.CountryName,
            Currency = i.Currency,
            CurrencyName = i.CurrencyName,
            CurrencySymbol = i.CurrencySymbol,
            TelephoneCountryCode = i.TelephoneCountryCode,
            UnitOfMeasure = i.UnitOfMeasure
        }).ToList();
    } }

好吧，我有单独的IOC类库项目，其中注册了依赖项 . 然后在Startup.cs类中注册它 . 由于在测试期间未调用Startup.cs类，因此不会注入依赖项 . 那么我该如何解决这个问题呢？

------更新根据官方文件中的指导原则-----

那么现在：我跟着this链接并按照它做了 . 在我看来，调用了Startup类，它也调用了ConfigureDependency.RegisterDependencies（..） .

Test Class:

public CountryServiceIntegrationTest()
    {
        _server = new TestServer(new WebHostBuilder()
            .UseStartup<Startup>());
        _client = _server.CreateClient();            
    }

    [Fact]
    public async Task ReturnHelloWorld()
    {
        //Act
        var response = await _client.GetAsync("/home/Test");
        response.EnsureSuccessStatusCode();

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

        //Assert
        Assert.Equal("test", responseString);
    }

Startup.ConfigureServices() :

public IConfigurationRoot Configuration { get; }

    //gets called in the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {      

        //services.AddSingleton<ILogUserActivityService, LogUserActivityService>();
        services.AddSingleton<ActivityLog>();
        // Add framework services.
        services.AddMvc();
        // Register Database Connection String
        var connectionSetting = new ConnectionSetting(Configuration["Data:ConnectionStrings:DefaultConnection"]);
        services.AddSingleton<IConnectionSetting>(connectionSetting);
        services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
        services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
        // Fill other dependencies
        var configureDependency = new ConfigureDependency();
        configureDependency.RegisterDependencies(services, connectionSetting);          

    }

ConfigureDependency.RegisterDependency(..):

public class ConfigureDependency
{
    public IDatabaseFactory DatabaseFactory { get; set; }
    public void RegisterDependencies(IServiceCollection services, IConnectionSetting connectionSetting)
    {

        services.AddDbContext<QuantumDbContext>(options => options.UseSqlServer(connectionSetting.Get()));

        services.AddTransient<IDatabaseFactory, DatabaseFactory>();
        services.AddTransient<IDbContext, TestDbContext>();
        services.AddTransient<IDbContext, QuantumDbContext>();

        ..................................................................
        ...........service n repositories  are registered here..............

  }
}

但现在发生的是我收到此错误：

由于调用Startup.cs然后调用ConfigureDependency类，这并不意味着应自动传递参数（services，connectionSetting） . 这是（ConfigureDependency.RegisterDependencies（..））我收到错误 .