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如何在 xUnit 中使用 generics 正確模擬擴展方法?

[英]How to properly mock extension methods with generics in xUnit?

所以我試圖模擬我的服務,這是真正的代碼:

public class PhaseService : IPhaseService
    {
        private readonly IRepository<Phase> _phaseRepository;
        private readonly IMapper _mapper;
        private readonly HrbContext _context;

        public PhaseService(IRepository<Phase> phaseRepository, IMapper mapper, HrbContext context)
        {
            _phaseRepository = phaseRepository;
            _mapper = mapper;
            _context = context;
        }

        public async Task<PhaseDto> GetAsync(Guid id)
        {
            var result = await _phaseRepository.GetActiveAsync(id);
            return _mapper.Map<PhaseDto>(result);
        }
}

它使用擴展方法,這是在這里:

namespace HRB_Server.Application.Extensions
{
    public static class RepositoryExtensions
    {
        /// <summary>
        /// Returns the entity to which the given id is a match (no navigation properties loaded). Throws exceptions if the entity is not found or if is not active.
        /// </summary>
        public static async Task<T> GetActiveAsync<T>(this IRepository<T> repo, Guid id)
            where T : BaseEntity
        {
            T entity = await repo.GetAsync(id);

            if (entity == null)
            {
                throw new EntityNotFoundException(typeof(T), id);
            }

            if (!entity.IsActive)
            {
                throw new EntityNotActiveException(typeof(T), id);
            }

            return entity;
        }
}

這是我的 xUnit 測試:

namespace HRB_Server.Tests.Services
{
    public class PhaseServiceTest
    {
        private readonly Mock<IRepository<Phase>> _repository;
        private readonly Mock<IMapper> _mapper;
        private readonly Mock<HrbContext> _context;

        public PhaseServiceTest()
        {
            _repository = new Mock<IRepository<Phase>>();
            //_mapper = new Mock<IMapper>();
            _mapper = null;
            //_context = new Mock<HrbContext>(new DbContextOptions<HrbContext>(), new HttpContextAccessor());
            _context = null;
        }

        [Fact]
        public void GetPhase_ActivePhaseObject_PhaseShouldExist()
        {
            // Arrange
            var newGuid = Guid.NewGuid();
            var phase = GetSamplePhase(newGuid);

            _repository.Setup(x => RepositoryExtensions.GetActiveAsync<Phase>(_repository, It.IsAny<Guid>()))
                .Returns(GetSamplePhase(newGuid));

            var phaseService = new PhaseService(_repository.Object, _mapper.Object, _context.Object);

            // Act
            var result = phaseService.GetAsync(newGuid);

            // Assert (expected, actual)
            Assert.Equal(phase.Result.Id, newGuid);
        }
}

我得到的錯誤是在 _repository 的設置中:

repository.Setup(x => RepositoryExtensions.GetActiveAsync<Phase>(_repository, It.IsAny<Guid>()))
                    .Returns(GetSamplePhase(newGuid));  

它說它不能將模擬存儲庫轉換為真實存儲庫,但我不應該在這里使用模擬存儲庫嗎?

我想要實現的是測試我的 REAL 服務和 mocking 存儲庫,對嗎? 我在這里做得對嗎?

假設您使用的是最小起訂量,請不要嘗試模擬擴展方法。

由於您控制了擴展方法的代碼,因此可以通過擴展方法模擬一條安全路徑。

在這種情況下,擴展使用GetAsync ,假設它也不是擴展,這就是需要模擬的內容。

//...

 _repository
    .Setup(x => x.GetAsync(It.IsAny<Guid>()))
    .ReturnsAsync(GetSamplePhase(newGuid));

//...

當通過GetActiveAsync代碼執行到 go 時,它將允許測試,如果失敗,還會拋出代碼中描述的異常等。

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