C#•2y ago

❔ Unit test: The source 'IQueryable' doesn't implement 'IAsyncEnumerable<T>'

My test keep failing when it trying to get to this line of code

var foods = await _foodRepository.FindAll().ToListAsync(cancellationToken);

var foods = await _foodRepository.FindAll().ToListAsync(cancellationToken);

Detail FindAll

IQueryable<T> FindAll(Expression<Func<T, bool>>? predicate = null);

IQueryable<T> FindAll(Expression<Func<T, bool>>? predicate = null);

Controller

    public async Task<IActionResult> GetAll(CancellationToken cancellationToken = default)
    {
        var foods = await _foodRepository.FindAll().ToListAsync(cancellationToken);
        return Ok(_mapper.Map<IEnumerable<FoodDTO>>(foods));
    }

    public async Task<IActionResult> GetAll(CancellationToken cancellationToken = default)
    {
        var foods = await _foodRepository.FindAll().ToListAsync(cancellationToken);
        return Ok(_mapper.Map<IEnumerable<FoodDTO>>(foods));
    }

Test

 public async Task FoodController_GetAll_ReturnOk()
    {
        #region[Arrange]
        var foods = A.Fake<IEnumerable<Food>>();
        var foodsDTO = A.Fake<IEnumerable<FoodDTO>>();
        A.CallTo(() => _mapper.Map<IEnumerable<FoodDTO>>(foods)).Returns(foodsDTO);
        var controller = new FoodController(_mapper, _foodRepository, _userFoodRepository);
        #endregion

        #region[Act]
        var result = await controller.GetAll();
        #endregion

        #region[Assert]
        result.Should().NotBeNull();
        result.Should().BeOfType(typeof(OkObjectResult));
        #endregion
    }

 public async Task FoodController_GetAll_ReturnOk()
    {
        #region[Arrange]
        var foods = A.Fake<IEnumerable<Food>>();
        var foodsDTO = A.Fake<IEnumerable<FoodDTO>>();
        A.CallTo(() => _mapper.Map<IEnumerable<FoodDTO>>(foods)).Returns(foodsDTO);
        var controller = new FoodController(_mapper, _foodRepository, _userFoodRepository);
        #endregion

        #region[Act]
        var result = await controller.GetAll();
        #endregion

        #region[Assert]
        result.Should().NotBeNull();
        result.Should().BeOfType(typeof(OkObjectResult));
        #endregion
    }

22 Replies

phaseshift•2y ago

Iqueryable is ienumerable, not the async version

TotechsStrypper•2y ago

I still don't understand these type can you provide me a fix for this situation ?

phaseshift•2y ago

Don't use ToListAsync ToList() should work Although ToList generally not a good idea to trigger on db queries

TotechsStrypper•2y ago

I don't have permission to change the controller implementation right now do we have any alternative to make the unittest fit for this controller ?

phaseshift•2y ago

Maybe you just need to add using System. Data.Entity

PontiacGTX•2y ago

what the repository implementation probably it fails due to the query?

TotechsStrypper•2y ago

TotechsStrypper•2y ago

the mock is not implement the right interface

PontiacGTX•2y ago

what is where if? there showing you to send the predicate and would do it where isn't null but you didnt send a predicate then it is null? _foodRepository.FindAll() so rather change the implementation for the FindAll repository's Method

Jayy•2y ago

@TotechsStrypper use this https://github.com/romantitov/MockQueryable

GitHub

GitHub - romantitov/MockQueryable: Mocking Entity Framework Core op...

Mocking Entity Framework Core operations such ToListAsync, FirstOrDefaultAsync etc - GitHub - romantitov/MockQueryable: Mocking Entity Framework Core operations such ToListAsync, FirstOrDefaultAsyn...

Jayy•2y ago

??? Good lord y'all lol You have to mock async stuff a little diff

TotechsStrypper•2y ago

So it cannot face the IQueryable a guy help me create a custom interface var foods = A.Fake<IEFMock>();

public interface IEFMock : IQueryable<Food>, IAsyncEnumerable<Food>
{
}

public interface IEFMock : IQueryable<Food>, IAsyncEnumerable<Food>
{
}

Jayy•2y ago

This will crash at runtime You have to mock all of IAsyncEnumerable Which the nuget i linked above does I've done this many times, it's an easy fix

TotechsStrypper•2y ago

Do you know how to do that with my current test ? I am a complete noob in FakeItEasy

Jayy•2y ago

Read the readme of the repo i just sent lol

TotechsStrypper•2y ago

TotechsStrypper•2y ago

wait

Jayy•2y ago

No lol, the library already handles all that for you Just read the docs and install the fake it easy version of the lib

TotechsStrypper•2y ago

Jayy•2y ago

There ya go

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

Gaming

Programming

❔ Unit test: The source 'IQueryable' doesn't implement 'IAsyncEnumerable<T>'