Musify/backend/Tests/Musify.Application.Tests/PlayLists/DeletePlayListCommandHandlerTests.cs

using ErrorOr;
using Musify.Application.Contracts;
using Musify.Application.PlayLists;
using Musify.Application.Tests.TestSupport;
using Musify.Domain.ValueObjects;
using NSubstitute;
using Xunit;

namespace Musify.Application.Tests.PlayLists
{
    public sealed class DeletePlayListCommandHandlerTests : HandlerTestBase
    {
        private readonly IEventBus eventBus = Substitute.For<IEventBus>();

        private DeletePlayListCommandHandler CreateHandler() => new(Database, eventBus, NoOpLogger<DeletePlayListCommandHandler>());

        [Fact]
        public async Task Handle_Owner_MarksPlayListAsRemoving()
        {
            var owner = TestEntities.User();
            var playList = TestEntities.PlayList(owner.Id);
            await SeedAsync(owner, playList);

            var result = await CreateHandler().Handle(new DeletePlayListCommand(owner.Id, playList.Id), TestContext.Current.CancellationToken);

            Assert.False(result.IsError);
            var stored = await Database.PlayLists.FindAsync([playList.Id], TestContext.Current.CancellationToken);
            Assert.NotNull(stored);
            Assert.Equal(LifeCycleStatus.Removing, stored.LifeCycleStatus);
            await eventBus.Received(1).PublishAsync(Arg.Any<Musify.Application.Events.DeletePlayListEvent>(), Arg.Any<CancellationToken>());
        }

        [Fact]
        public async Task Handle_PlayListMissing_ReturnsNotFound()
        {
            var result = await CreateHandler().Handle(new DeletePlayListCommand(1, Guid.NewGuid()), TestContext.Current.CancellationToken);

            Assert.Equal(ErrorType.NotFound, result.FirstError.Type);
        }

        [Fact]
        public async Task Handle_NotOwner_ReturnsUnauthorized()
        {
            var owner = TestEntities.User(1, "owner");
            var stranger = TestEntities.User(2, "stranger");
            var playList = TestEntities.PlayList(owner.Id);
            await SeedAsync(owner, stranger, playList);

            var result = await CreateHandler().Handle(new DeletePlayListCommand(stranger.Id, playList.Id), TestContext.Current.CancellationToken);

            Assert.Equal(ErrorType.Unauthorized, result.FirstError.Type);
        }
    }
}