C# 依赖注入和双重测试
我不熟悉使用依赖项注入。例如,我有这样一个示例服务:C# 依赖注入和双重测试,c#,unit-testing,dependency-injection,C#,Unit Testing,Dependency Injection,我不熟悉使用依赖项注入。例如,我有这样一个示例服务: public class ValidationService<T> where T : Entity<T> { private IRepository<T> repository; private IValidator<T> validator; public ValidationService(IRepository<T> repository, IVa
public class ValidationService<T> where T : Entity<T>
{
private IRepository<T> repository;
private IValidator<T> validator;
public ValidationService(IRepository<T> repository, IValidator<T> validator)
{
this.repository = repository;
this.validator = validator;
}
public String ValidationMessage
{
get;
private set;
}
public Boolean TryValidate(Guid Id)
{
try
{
var item = repository.Get(Id);
if(null != item)
{
this.Validator.ValidateAndThrow(entity);
return true;
}
this.ValidationMessage = String.Format("item {0} doesn't exist in the repository", Id);
}
catch(ValidationException ex)
{
this.ValidationMessage = ex.Message;
}
return false;
}
}
是的,绝对是。让您的单元测试用mock实例化服务,让您的应用程序通过真正的实现 示例(使用最小起订量):
公共类实体,其中T:Entity{}
公共类MyEntity:实体{}
var mockValidator=new Mock();
var mockRepository=new Mock();
var id=Guid.NewGuid();
var entity=new MyEntity();
mockRepository.Setup(r=>r.Get(id)).Returns(entity);
mockValidator.Setup(v=>v.ValidateAndThrow(实体));
IsTrue(新的ValidationService(mockRepository.Object,mockValidator.Object).TryValidate(id));
mockRepository.VerifyAll();
mockValidator.VerifyAll();
您确定该类型约束吗?它是否应该在T:Entitypossible重复@MylesMcDonnell?为什么不呢?因为(除非我现在是个笨蛋)不可能用该类型约束实例化ValidationService。请参见此处:@mylescdonnell查看编辑。
public class Entity<T> where T : Entity<T>
{
public Boolean GotInstantiated { get { return true; } }
}
public class Service<T> where T : Entity<T>
{
public Boolean GetInstantiated(T entity)
{
return entity.GotInstantiated;
}
}
public class Dunce : Entity<Dunce>
{
}
class Program
{
public static void Main(String[] args)
{
var instance = new Dunce();
var service = new Service<Dunce>();
Console.Write(service.GetInstantiated(instance) + Environment.NewLine);
Console.Write("Press any key to continue . . . ");
Console.ReadKey(true);
}
}
public class Entity<T> where T : Entity<T>{}
public class MyEntity : Entity<MyEntity>{}
var mockValidator = new Mock<IValidator<MyEntity>>();
var mockRepository = new Mock<IRepository<MyEntity>>();
var id = Guid.NewGuid();
var entity = new MyEntity();
mockRepository.Setup(r => r.Get(id)).Returns(entity);
mockValidator.Setup(v => v.ValidateAndThrow(entity));
Assert.IsTrue(new ValidationService<MyEntity>(mockRepository.Object, mockValidator.Object).TryValidate(id));
mockRepository.VerifyAll();
mockValidator.VerifyAll();