使用 lambda 表达式作为输入参数的 xUnit 模拟方法

Question

I have a method like this one:

public Task<IEnumerable<VwSubscriptionProductsPf>> GetVwSubscriptionProductsBy(
    Expression<Func<VwSubscriptionProductsPf, object>> lambda)
{
    var result = GetList(lambda);
    return result;
}

The method is called like this:

var products = await _uow.VwSubscriptionProductsRepository
                   .GetVwSubscriptionProductsBy(s => s.SubscriptionId == subscription.Id);

And now I want to mock the return of the method using xUnit.

var products = new List<VwSubscriptionProductsPf> 
    { new VwSubscriptionProductsPf { SubscriptionId = 1, Name = "Product 1" }};

_uow.Setup(x => x.VwSubscriptionProductsRepository
    .GetVwSubscriptionProductsBy(s => s.SubscriptionId == 1))
    .Returns(Task.FromResult(products.AsEnumerable()));

Can you tell me what am I missing?

PS. The problem is that the GetVwSubscriptionProductsBy returns an empty IEnumerable , and I'm waiting for the IEnumerable with one element manually created by me.

Answer 1

I found the answer, the method can be mocked like this:

_uow.Setup(x => x.VwSubscriptionProductsRepository.GetVwSubscriptionProductsBy(It.IsAny<Expression<Func<VwSubscriptionProductsPf, object>>>()))
    .Returns(Task.FromResult(products.AsEnumerable()));