如何为每个测试创建单独的内存数据库? [英] How to create separate in memory database for each test?
问题描述
我正在 .NET Core 3.0 上使用 xunit 编写测试,但内存数据库出现问题.我需要为每个测试创建一个单独的数据库,但现在我创建了一个导致问题的数据库,但我不知道如何为每个测试创建一个新数据库.
I'm writing a test with xunit on .NET Core 3.0 and I have a problem with the in-memory database. I need a separate database for each test but now I create a single database that causes problems, but I have no idea how to create a new database for each test.
public class AccountAdminTest : IClassFixture<CustomWebApplicationFactory<Startup>>
{
private readonly HttpClient _client;
private IServiceScopeFactory scopeFactory;
private readonly CustomWebApplicationFactory<Startup> _factory;
private ApplicationDbContext _context;
public AccountAdminTest(CustomWebApplicationFactory<Startup> factory)
{
_factory = factory;
_client = _factory.CreateClient(new WebApplicationFactoryClientOptions
{
AllowAutoRedirect = true,
BaseAddress = new Uri("https://localhost:44444")
});
scopeFactory = _factory.Services.GetService<IServiceScopeFactory>();
var scope = scopeFactory.CreateScope();
_context = scope.ServiceProvider.GetService<ApplicationDbContext>();
}
}
public class CustomWebApplicationFactory<TStartup> : WebApplicationFactory<TStartup> where TStartup : class
{
protected override void ConfigureWebHost(IWebHostBuilder builder)
{
builder.ConfigureTestServices(services =>
{
var descriptor = services.SingleOrDefault(
d => d.ServiceType ==
typeof(DbContextOptions<ApplicationDbContext>));
if (descriptor != null)
{
services.Remove(descriptor);
}
services.AddDbContext<ApplicationDbContext>((options, context) =>
{
context.UseInMemoryDatabase("IdentityDatabase");
});
});
}
}
<小时>
现在看起来像这样,但仍然不起作用.当我改变 AddDbContext 的生命周期时,它不会改变任何东西.
Now it's look like this but still dosen't work. When i change lifetime on AddDbContext it doesn't change anything.
public class AccountAdminTest : IDisposable
{
public AccountAdminTest(ITestOutputHelper output)
{
this.output = output;
_factory = new CustomWebApplicationFactory<Startup>();
_client = _factory.CreateClient(new WebApplicationFactoryClientOptions
{
AllowAutoRedirect = true,
BaseAddress = new Uri("https://localhost:44444")
});
scopeFactory = _factory.Services.GetService<IServiceScopeFactory>();
_scope = scopeFactory.CreateScope();
_context = _scope.ServiceProvider.GetService<ApplicationDbContext>();
var _user = User.getAppAdmin();
_context.Add(_user);
_context.SaveChanges(); //Here i got error on secound test. It says "An item with the same key has already been added"
}
public void Dispose()
{
_scope.Dispose();
_factory.Dispose();
_context.Dispose();
_client.Dispose();
}
<小时>
使用 Guid 作为数据库名称时无法获取令牌.它说用户名/密码无效.我使用 IdentityServer 进行身份验证
I can't get token when use Guid as db name. It says that username/password is not valid. I use IdentityServer for authentication
public async Task<string> GetAccessToken(string userName, string password, string clientId, string scope)
{
var disco = await _client.GetDiscoveryDocumentAsync("https://localhost:44444");
if (!String.IsNullOrEmpty(disco.Error))
{
throw new Exception(disco.Error);
}
var response = await _client.RequestPasswordTokenAsync(new PasswordTokenRequest
{
Address = disco.TokenEndpoint,
ClientId = clientId,
Scope = scope,
UserName = userName,
Password = password,
});
return response.AccessToken;
}
推荐答案
您需要更改的只是这里的代码:
All you need to change is this code here:
services.AddDbContext<ApplicationDbContext>((options, context) =>
{
context.UseInMemoryDatabase("IdentityDatabase");
});
代替常量值"IdentityDatabase"
,使用类似Guid.NewGuid().ToString()
:
Instead of the constant value "IdentityDatabase"
, use something like Guid.NewGuid().ToString()
:
context.UseInMemoryDatabase(Guid.NewGuid().ToString());
然后,每次获取上下文时,它将使用一个新的内存数据库.
Then, every time the context is fetched, it will be using a new in-memory database.
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