我正在做一个简单的单元测试,在创建类(class)时,标题字段不能为空。我必须使用具有 UnitOfWork 依赖注入(inject)的服务类来测试它。当我调试测试时,出现异常错误 Can not instantiate proxy of class: ContosoUniversity.Models.CourseRepository
我调查了该错误,但无法理解如何解决该问题,并且Assert 语句?
类(class)资料库
public class CourseRepository : GenericRepository<Course>
{
public CourseRepository(SchoolContext context)
: base(context)
{
}
工作单元
public class UnitOfWork : IDisposable, IUnitOfWork
{
private SchoolContext context = new SchoolContext();
private GenericRepository<Department> departmentRepository;
private CourseRepository courseRepository;
public CourseRepository CourseRepository
{
get
{
if (this.courseRepository == null)
{
this.courseRepository = new CourseRepository(context);
}
return courseRepository;
}
}
public virtual CourseRepository GetCourseRepository()
{
if (this.courseRepository == null)
{
this.courseRepository = new CourseRepository(context);
}
return courseRepository;
}
类(class)服务
public class CourseService : ICourseService
{
private IUnitOfWork unitOfWork;
public CourseService (IUnitOfWork unitOfWork)
{
this.unitOfWork = unitOfWork;
}
public void Create(Course course)
{
unitOfWork.GetCourseRepository().Insert(course);
unitOfWork.Save();
}
public Course GetCourseByID(int id)
{
return unitOfWork.GetCourseRepository().GetByID(id);
}
测试方法
[TestMethod]
public void TestMethod1()
{
var course = new Course
{
CourseID = 2210,
Title = string.Empty,
Credits = 3,
DepartmentID = 1
};
Mock<CourseRepository> mockRepo = new Mock<CourseRepository>();
mockRepo.Setup(m => m.GetByID(course.CourseID)).Returns(course);
var mockUnit = new Mock<IUnitOfWork>();
mockUnit.Setup(x => x.GetCourseRepository()).Returns(mockRepo.Object);
var myService = new CourseService(mockUnit.Object);
myService.Create(course);
//var error = _modelState["Title"].Errors[0];
//Assert.AreEqual("The Title field is required.", error.ErrorMessage);
//mockRepo.Setup(x => x.Insert(course));
}
最佳答案
错误表明 CourseRepository
无法初始化,因为它没有无参数构造函数。模拟框架首先寻找无参数构造函数来创建模拟对象。
如果您的类没有无参数构造函数,那么您需要在创建 Mock 时传递这些参数。在您的情况下,CourseRepository
的模拟将创建如下。
var repositoryMock = new Mock<CourseRepository>(null);
除了 null,您还可以传递构造函数参数的模拟对象。
关于c# - 无法实例化类错误的代理,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42254974/