如何解决Abstract Generic Mocking - 无法实例化属性的代理类?
我试图在一个抽象泛型类中模拟一个函数,它的构造函数中有更多的抽象类。
测试如下:
[Test]
public void AbstractRepotest()
{
var options = new Mock<DbContextOptions<CustomDbContext>>();
var db = new Mock<CustomDbContext>(options);
var repo = new Mock<BaseRepository<EntityBase>>(db);
var service = new Mock<BaseService<EntityBase>>(repo,db);
IQueryable<FactTableRevenue> theInfo = Enumerable.Empty<FactTableRevenue>().AsQueryable();
repo.Setup(x => x.GetById("test")).Returns(theInfo);
var abstractService = service.Object;
Assert.AreEqual(theInfo,abstractService.GetById("test"));
}
这是 CustomDbContext 构造函数:
public class CustomDbContext : DbContext
{
public CustomDbContext(DbContextOptions<CustomDbContext> options) : base(options)
{
}
}
这是 BaseRepository 构造函数:
public abstract class BaseRepository<T> where T : EntityBase
{
internal readonly CustomDbContext _db;
public BaseRepository(CustomDbContext db)
{
_db = db;
}
}
这是 BaseService 构造函数:
public abstract class BaseService<T> where T : EntityBase
{
public DbContext _db { get; }
public BaseRepository<T> _repository;
public BaseService(BaseRepository<T> repository,DbContext db)
{
_repository = repository;
_db = db;
}
}
Tests.UnitTestService.AbstractRepoTest
Castle.DynamicProxy.InvalidProxyconstructorargumentsException : Can not instantiate proxy of class: Services.Services.BaseService`1[[Database.Common.E...
Castle.DynamicProxy.InvalidProxyconstructorargumentsException : Can not instantiate proxy of class: Services.Services.BaseService`1[[Database.Common.EntityBase,Database,Version=1.0.0.0,Culture=neutral,PublicKeyToken=null]].
Could not find a constructor that would match given arguments:
Moq.Mock`1[Services.Repositories.BaseRepository`1[Database.Common.EntityBase]]
Moq.Mock`1[Database.CustomDbContext.CustomDbContext]
at Castle.DynamicProxy.proxygenerator.CreateClassproxyInstance(Type proxyType,List`1 proxyArguments,Type classtoProxy,Object[] constructorarguments)
at Castle.DynamicProxy.proxygenerator.CreateClassproxy(Type classtoProxy,Type[] additionalInterfacesToProxy,proxygenerationoptions options,Object[] constructorarguments,IInterceptor[] interceptors)
at Moq.CastleProxyFactory.CreateProxy(Type mockType,IInterceptor interceptor,Type[] interfaces,Object[] arguments) in C:\projects\moq4\src\Moq\ProxyFactories\CastleProxyFactory.cs:line 62
at Moq.Mock`1.InitializeInstance() in C:\projects\moq4\src\Moq\Mock`1.cs:line 311
at Moq.Mock`1.OnGetobject() in C:\projects\moq4\src\Moq\Mock`1.cs:line 325
at Moq.Mock.get_Object() in C:\projects\moq4\src\Moq\Mock.cs:line 179
at Moq.Mock`1.get_Object() in C:\projects\moq4\src\Moq\Mock`1.cs:line 283
at Tests.UnitTestService.AbstractRepotest() in C:\Users\USER\RiderProjects\REST\Tests\UnitTestService.cs:line 58
解决方法
您遇到的构造问题很可能是您将模拟对象(例如,db
)而不是模拟对象(例如,db.Object
)传递给模拟构造函数。
var options = new Mock<DbContextOptions<CustomDbContext>>();
var db = new Mock<CustomDbContext>(options);
var repo = new Mock<BaseRepository<EntityBase>>(db.Object);
var service = new Mock<BaseService<EntityBase>>(repo.Object,db.Object);
,
有两个问题。我在嘲笑选项并将其提供给我的 DbContext 实现,并且我没有将对象传递给构造函数而不是模拟。
我通过添加一个空的构造函数更改了 CustomDbContext:
protected CustomDbContext(){}
并删除了选项并实现了模拟:
var db = new Mock<CustomDbContext>();
var repo = new Mock<BaseRepository<EntityBase>>(db.Object);
var service = new Mock<BaseService<EntityBase>>(repo.Object,db.Object);
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