xUnit测试和.NET Core 2.0中的自动映射

Question

我有.NET Core 2.0项目，其中包含存储库模式和xUnit测试。

现在，这里有一些代码。

控制器：

public class SchedulesController : Controller
{
    private readonly IScheduleRepository repository;
    private readonly IMapper mapper;

    public SchedulesController(IScheduleRepository repository, IMapper mapper)
    {
        this.repository = repository;
        this.mapper = mapper;
    }

    [HttpGet]
    public IActionResult Get()
    {
        var result = mapper.Map<IEnumerable<Schedule>, IEnumerable<ScheduleDto>>(source: repository.items);
        return new OkObjectResult(result);
    }
}

我的测试班：

public class SchedulesControllerTests
{
    [Fact]
    public void CanGet()
    {
        try
        {
            //Arrange
            Mock<IScheduleRepository> mockRepo = new Mock<IScheduleRepository>();
            mockRepo.Setup(m => m.items).Returns(new Schedule[]
            {
                new Schedule() { Id=1, Title = "Schedule1" },
                new Schedule() { Id=2, Title = "Schedule2" },
                new Schedule() { Id=3, Title = "Schedule3" }
            });

            var mockMapper = new Mock<IMapper>();
            mockMapper.Setup(x => x.Map<Schedule>(It.IsAny<ScheduleDto>()))
                .Returns((ScheduleDto source) => new Schedule() { Title = source.Title });

            SchedulesController controller = new SchedulesController(repository: mockRepo.Object, mapper: mockMapper.Object);

            //Act
            var result = controller.Get();

            //Assert
            var okResult = result as OkObjectResult;
            Assert.NotNull(okResult);

            var model = okResult.Value as IEnumerable<ScheduleDto>;
            Assert.NotNull(model);

        }
        catch (Exception ex)
        {
            //Assert
            Assert.False(false, ex.Message);
        }
    }
}

我面临的问题。

我的问题是，当我使用数据库上下文运行此代码并执行Get()方法时，它工作正常，它给了我所有结果。

但是当我尝试运行测试用例时，它没有返回任何Dto对象的数据。当我调试时，我发现了

1. 我使用mockRepo在控制器中获取我的测试对象。
2. 但看起来Auto mapper没有正确初始化，因为虽然映射它没有返回任何内容 var result = mapper.Map<IEnumerable<Schedule>, IEnumerable<ScheduleDto>>(source: repository.items);

我到底尝试了什么？

我遵循了所有这些答案，但仍然无法正常工作。

Mocking Mapper.Map() in Unit Testing

How to Mock a list transformation using AutoMapper

所以，我需要一些擅长xUnit和automapper的人的帮助，并且需要有关如何正确初始化mock Mapper的指导。

Answer 1

最后它对我有用，我这样跟着How to Write xUnit Test for .net core 2.0 Service that uses AutoMapper and Dependency Injection?

在这里，我发布我的答案和测试类，所以如果需要其他SO可以使用。

public class SchedulesControllerTests
{
    [Fact]
    public void CanGet()
    {
        try
        {
            //Arrange
            //Repository
            Mock<IScheduleRepository> mockRepo = new Mock<IScheduleRepository>();
            var schedules = new List<Schedule>(){
                new Schedule() { Id=1, Title = "Schedule1" },
                new Schedule() { Id=2, Title = "Schedule2" },
                new Schedule() { Id=3, Title = "Schedule3" }
            };

            mockRepo.Setup(m => m.items).Returns(value: schedules);

            //auto mapper configuration
            var mockMapper = new MapperConfiguration(cfg =>
            {
                cfg.AddProfile(new AutoMapperProfile());
            });
            var mapper = mockMapper.CreateMapper();

            SchedulesController controller = new SchedulesController(repository: mockRepo.Object, mapper: mapper);

            //Act
            var result = controller.Get();

            //Assert
            var okResult = result as OkObjectResult;
            if (okResult != null)
                Assert.NotNull(okResult);

            var model = okResult.Value as IEnumerable<ScheduleDto>;
            if (model.Count() > 0)
            {
                Assert.NotNull(model);

                var expected = model?.FirstOrDefault().Title;
                var actual = schedules?.FirstOrDefault().Title;

                Assert.Equal(expected: expected, actual: actual);
            }
        }
        catch (Exception ex)
        {
            //Assert
            Assert.False(false, ex.Message);
        }
    }
}

Answer 2

我需要注入IMapper，使用ProjectTo来获取映射的IQueryable，然后在map之后在queryable上实现更多逻辑。所以这就是我做的嘲笑：

var models = new object[]
{
    ⋮
}.AsQueryable();
var mapper = new Mock<IMapper>();
mapper.Setup(x => x.ProjectTo(
        It.IsAny<IQueryable>(),
        It.IsAny<object>(),
        It.IsAny<Expression<Func<object, object>>[]>()))
    .Returns(models);