furniture-bff/tests/Furniture.Bff.Application.UnitTests/GetFurnitureAvailabilityHandlerTests.cs

using Furniture.Bff.Application.Adapters;
using Furniture.Bff.Application.Handlers;
using Furniture.Bff.Contracts.Api;

namespace Furniture.Bff.Application.UnitTests;

public class GetFurnitureAvailabilityHandlerTests
{
    [Fact]
    public async Task HandleAsync_WhenCalled_DelegatesToServiceClient()
    {
        var handler = new GetFurnitureAvailabilityHandler(new FakeFurnitureServiceClient());

        var response = await handler.HandleAsync(new GetFurnitureAvailabilityApiRequest("FUR-001"));

        Assert.Equal("FUR-001", response.FurnitureId);
        Assert.Equal(3, response.QuantityAvailable);
    }

    private sealed class FakeFurnitureServiceClient : IFurnitureServiceClient
    {
        public Task<GetFurnitureAvailabilityApiResponse> GetAvailabilityAsync(string furnitureId)
        {
            return Task.FromResult(new GetFurnitureAvailabilityApiResponse(furnitureId, 3));
        }
    }
}