furniture-service/tests/Furniture.Service.Application.UnitTests/GetFurnitureAvailabilityUseCaseTests.cs

using Furniture.Service.Application.Ports;
using Furniture.Service.Application.UseCases;
using Furniture.Service.Contracts.UseCases;

namespace Furniture.Service.Application.UnitTests;

public class GetFurnitureAvailabilityUseCaseTests
{
    [Fact]
    public async Task HandleAsync_WhenCalled_DelegatesToReadPort()
    {
        var port = new FakeFurnitureAvailabilityReadPort();
        var useCase = new GetFurnitureAvailabilityUseCase(port);

        var response = await useCase.HandleAsync(new GetFurnitureAvailabilityRequest("FUR-001"));

        Assert.Equal("FUR-001", response.FurnitureId);
        Assert.Equal(10, response.QuantityAvailable);
    }

    private sealed class FakeFurnitureAvailabilityReadPort : IFurnitureAvailabilityReadPort
    {
        public Task<GetFurnitureAvailabilityResponse> GetAvailabilityAsync(string furnitureId)
        {
            return Task.FromResult(new GetFurnitureAvailabilityResponse(furnitureId, 10));
        }
    }
}