c# – 验证Moq中的可枚举列表

我正在尝试为一个看起来像这样的方法编写一个单元测试：

public int Save(IEnumerable<int> addedIds,IEnumerable<int> removedIds)
{
    var existingIds = repository.Get();
    IEnumerable<int> ids = existingIds.Except(removedIds).Union(addedIds));
    return repository.Create(ids);
}

Moq的测试看起来像这样：

repository.Setup(r => r.Get()).Returns(CreateList());
service.Save(addedIds,removedIds);
repository.Verify(r => r.Create(It.Is<IEnumerable<int>>(l => VerifyList(l))));

这失败,出现此错误,并且从不调用VerifyList()：

Expected invocation on the mock at least once,but was never
performed:

r => r.Create(It.Is<IEnumerable'1>(list => VerifyList(list)))

Performed invocations:

IRepo.Create(System.Linq.Enumerable+<UnionIterator>d__88'1[system.int32])

由于调用的类型不是IEnumerable< int>但实际上是System.Linq.Enumerable< UnionIterator> d__88’1 [system.int32]),测试失败. (逐步完成测试,一切正常,结果如预期)

如果我在测试中的方法中调用ids.ToList(),结果如下：

Expected invocation on the mock at least once,but was never performed:

r => r.Create(It.Is<List'1>(l => VerifyList(l)))

Performed invocations:
IRepo.Create(System.Collections.Generic.List'1[system.int32])

这有什么办法吗？或者我做错了什么？

编辑：事实证明我在我的VerifyList方法中有一个错误,所以它返回false,但是Moq没有给我这些信息.类型差异是红鲱鱼..

解决方法

这似乎有效.但是做了一些假设.猜猜验证方法可能更好. =)

[Test]
    public void test()
    {
        // SETUP
        Mock<IRepository> repository = new Mock<IRepository>();
        Service service = new Service(repository.Object);
        repository.Setup(r => r.Get()).Returns(CreateList());

        IEnumerable<int> addedIds = new[]{1,2};
        IEnumerable<int> removedIds = new[]{3,4};
        service.Save(addedIds,removedIds);

        repository.Verify(r => r.Create(It.Is<IEnumerable<int>>(l => VerifyList(l))));
    }

    private static bool VerifyList(IEnumerable<int> enumerable)
    {
        return enumerable.Contains(1) && enumerable.Contains(2) && enumerable.Contains(5);
    }

    private IEnumerable<int> CreateList()
    {
        return new[] { 3,4,5 };
    }

    public interface IRepository
    {
        IEnumerable<int> Get();
        int Create(IEnumerable<int> id);
    }
    public class Service
    {
        public Service(IRepository repository)
        {
            this.repository = repository;
        }

        private IRepository repository;

        public int Save(IEnumerable<int> addedIds,IEnumerable<int> removedIds)
    {
        var existingIds = repository.Get();
            IEnumerable<int> ids = existingIds.Except(removedIds).Union(addedIds);

        return repository.Create(ids);
    }