带有Autofac的XUnit Test Constructor依赖注入

如果要在ASP.NET Core MVC/WebApi上进行集成测试，则应该使用TestServer类，该类将使用您已经在其中配置的所有IoC启动整个应用程序.I am implementing Xunit with Autofac, I could make it work by below code: using (var scoped = DbFixture.Container.Resolve<UserReponsitory>()) { var result = (scoped.GetAll()).ToList().Count(); Assert.Equal(2, result); }But I want to inject UserReponsitory to test method instead of using DbFixture.Container.Resolve. Is it possible to make below code work?UnitTest1.cs namespace XUnitTestPro{ public class UnitTest1:IClassFixture<DbFixture> { private IUserReponsitory _userReponsitory; public UnitTest1(IUserReponsitory userReponsitory) { _userReponsitory = userReponsitory; } [Fact] public void Test1() { //using (var scoped = DbFixture.Container.Resolve<UserReponsitory>()) //{ // var result = (scoped.GetAll()).ToList().Count(); // Assert.Equal(2, result); //} var result = _userReponsitory.GetAll().ToList().Count(); Assert.Equal(2, result); } }}DbFixture.csnamespace XUnitTestPro{ public class DbFixture { public static IContainer Container { get; set; } public DbFixture() { var builder = new ContainerBuilder(); var option = new DbContextOptionsBuilder<UserContext>().UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Database=EFProject;Trusted_Connection=True;MultipleActiveResultSets=true").Options; UserContext context = new UserContext(option); builder.RegisterInstance(context).As<UserContext>(); builder.RegisterType<UserReponsitory>().AsSelf().As<IUserReponsitory>(); builder.RegisterAssemblyTypes(typeof(DbFixture).GetTypeInfo().Assembly); Container = builder.Build(); } }}At present, I got below error, it seems to be related with IClassFixture<DbFixture> and public UnitTest1(IUserReponsitory userReponsitory) are different.Is there any way to achieve below code without call DbFixture.Container.Resolve which is similar to inject MVC Controller?public UnitTest1(IUserReponsitory userReponsitory) { _userReponsitory = userReponsitory; }In other words, how could I dependence inject Unit Test class?Any help would be appreciated. 解决方案 Dependency Injection support in xUnit is kinda limited.When you implement IClassFixture<DbFixture> interface, then xUnit expects one DbFixture parameter in it's constructor, and the type of the parameter depends on T in IClassFixture<T>.That being said, when you implmenent IClassFixture<DbFixture> your constructor must look like public UnitTest1(DbFixture). But you have IUserRepository, so xUnit doesn't know what to inject in there.You can also implement multiple IClassFixture<T> types, but you can use each T only once per test class.From the official xUnit docs on shared context (IClassFixture<T>):UpdateIt's still possible to use the IoC container resolve it, just not with constructor injection.public class DbFixture{ public IContainer Container { get; private set; } public DbFixture() { var builder = new ContainerBuilder(); var option = new DbContextOptionsBuilder<UserContext>().UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Database=EFProject;Trusted_Connection=True;MultipleActiveResultSets=true").Options; UserContext context = new UserContext(option); builder.RegisterInstance(context).As<UserContext>(); builder.RegisterType<UserReponsitory>().AsSelf().As<IUserReponsitory>(); builder.RegisterAssemblyTypes(typeof(DbFixture).GetTypeInfo().Assembly); Container = builder.Build(); }}public class UnitTest1:IClassFixture<DbFixture>{ private IUserReponsitory _userReponsitory; public UnitTest1(DbFixture fixture) { // resolve it here _userReponsitory = fixture.Container.Resolve<IUserRepository>(); } [Fact] public void Test1() { //using (var scoped = DbFixture.Container.Resolve<UserReponsitory>()) //{ // var result = (scoped.GetAll()).ToList().Count(); // Assert.Equal(2, result); //} var result = _userReponsitory.GetAll().ToList().Count(); Assert.Equal(2, result); }}However, the question is rather is that good way to use it? Not sure what you want to reach, but if you want do unit tests, then you don't have to use IoC container at all or concrete classes, just mocks and the type you are testing.If you want do integration tests on ASP.NET Core MVC / WebApi, then you should rather use TestServer class which spins up the whole application with all IoC you have configured there already. 这篇关于带有Autofac的XUnit Test Constructor依赖注入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！