无法在集成测试中在模拟的 InMemory 数据库中播种数据

Question

我有下一个测试类，其中包含一个调用简单 api 端点的集成测试。

在设置方法中，我将真实数据库替换为 InMemory 并尝试将有关两个城市的信息添加到数据库中。

 public class TestControllerTest
 {
     private WebApplicationFactory<RentAPI.Program> _factory;
     private HttpClient _client;

     [SetUp]
     public void Setup()
     {
         _factory = new WebApplicationFactory<RentAPI.Program>().WithWebHostBuilder(builder =>
         {
             builder.ConfigureTestServices(services =>
             {
                 var dbContextDescriptor = services.SingleOrDefault(d =>
                     d.ServiceType == typeof(DbContextOptions<ApplicationDbContext>));

                 services.Remove(dbContextDescriptor);

                 services.AddDbContext<ApplicationDbContext>(options =>
                 {
                     options.UseInMemoryDatabase(Guid.NewGuid().ToString());
                 });

                 using var scope = services.BuildServiceProvider().CreateScope();
                 var db = scope.ServiceProvider.GetService<ApplicationDbContext>();

                 SeedData(db);
             });
         });

         _client = _factory.CreateClient();
     }

     [Test]
     public async Task Test_test()
     {

         var response = await _client.GetAsync("/Test");
         var stingResult = await response.Content.ReadAsStringAsync();

         Assert.That(stingResult, Is.EqualTo("3"));
     }

     [TearDown]
     public void TearDown()
     {
         _client.Dispose();
         _factory.Dispose();
     }

     public static void SeedData(ApplicationDbContext context)
     {
         context.Cities.AddRange(
             new City { Id = 1, Name = "City1" },
             new City { Id = 2, Name = "City2" }
         );

         context.SaveChanges();
     }
 }

这是终点

[ApiController, Route("[controller]")]
public class TestController : ControllerBase
{
    private readonly IUnitOfWork _uow;

    public TestController(IUnitOfWork uow) => _uow = uow;

    [HttpGet]
    public async Task<ActionResult<string>> Test()
    {
        await _uow.CityRepository.AddAsync(new City() { Id = 99, Name = "Poko" });
        await _uow.CompleteAsync();

        var cities = await _uow.CityRepository.FindAllAsync();
        return cities.Count().ToString();
    }
}

问题是，尽管我尝试将城市信息添加到我的应用程序使用的数据库中，但当我在测试中调用端点时，这些记录不会出现。

这是测试结果：

  String lengths are both 1. Strings differ at index 0.
  Expected: "3"
  But was:  "1"
  -----------^

Answer 1

将种子移出

ConfigureTestServices

和

WithWebHostBuilder

:

 public void Setup()
 {
     _factory = new WebApplicationFactory<Program>().WithWebHostBuilder(builder =>
     {
         builder.ConfigureTestServices(services =>
         {
             var dbContextDescriptor = services.SingleOrDefault(d =>
                 d.ServiceType == typeof(DbContextOptions<ApplicationDbContext>));

             services.Remove(dbContextDescriptor);

             services.AddDbContext<ApplicationDbContext>(options =>
             {
                 options.UseInMemoryDatabase(Guid.NewGuid().ToString());
             });
            
         });
     });
    
     using var scope =  _factory.Services.CreateScope();;
     var db = scope.ServiceProvider.GetService<ApplicationDbContext>();

     SeedData(db);
     _client = _factory.CreateClient();
 }

您当前的代码：

using var scope = services.BuildServiceProvider().CreateScope();

构建一个单独的 DI 容器，其中包含所有不同的服务，这些服务与测试服务器使用的服务无关。