Musify/backend/Tests/Musify.Application.Tests/Albums/DeleteAlbumCommandHandlerTests.cs

using ErrorOr;
using Musify.Application.Albums;
using Musify.Application.Tests.TestSupport;
using Xunit;

namespace Musify.Application.Tests.Albums
{
    public sealed class DeleteAlbumCommandHandlerTests : HandlerTestBase
    {
        private DeleteAlbumCommandHandler CreateHandler() => new(Database, NoOpLogger<DeleteAlbumCommandHandler>());

        [Fact]
        public async Task Handle_Owner_RemovesAlbum()
        {
            var owner = TestEntities.User();
            var album = TestEntities.UserAlbum(owner.Id);
            await SeedAsync(owner, album);

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

            Assert.False(result.IsError);
            Assert.Null(await Database.UserAlbums.FindAsync([album.Id], TestContext.Current.CancellationToken));
        }

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

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

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

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

            Assert.Equal(ErrorType.Unauthorized, result.FirstError.Type);
            Assert.NotNull(await Database.UserAlbums.FindAsync([album.Id], TestContext.Current.CancellationToken));
        }
    }
}