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

using Musify.Application.PlayLists;
using Musify.Application.Tests.TestSupport;
using Musify.Domain.ValueObjects;
using Xunit;

namespace Musify.Application.Tests.PlayLists
{
    public sealed class GetPlayListsByUserIdQueryHandlerTests : HandlerTestBase
    {
        private GetPlayListsByUserIdQueryHandler CreateHandler() => new(Database);

        [Fact]
        public async Task Handle_ReturnsOnlyActivePlayListsForThatUser()
        {
            var owner = TestEntities.User(1, "owner");
            var other = TestEntities.User(2, "other");
            await SeedAsync(
                owner, other,
                TestEntities.PlayList(owner.Id, "Mine"),
                TestEntities.PlayList(owner.Id, "Being removed", lifeCycleStatus: LifeCycleStatus.Removing),
                TestEntities.PlayList(other.Id, "Theirs"));

            var result = await CreateHandler().Handle(new GetPlayListsByUserIdQuery(owner.Id, Name: null, PageNumber: 1, PageSize: 10, ViewerId: owner.Id), TestContext.Current.CancellationToken);
            var playList = Assert.Single(result.Items);
            Assert.Equal("Mine", playList.Name);
        }

        [Fact]
        public async Task Handle_AnotherViewer_ReturnsOnlyPublicPlayLists()
        {
            var owner = TestEntities.User();
            await SeedAsync(
                owner,
                TestEntities.PlayList(owner.Id, "Public one", visibility: PlayListVisibility.Public),
                TestEntities.PlayList(owner.Id, "Private one", visibility: PlayListVisibility.Private));

            var result = await CreateHandler().Handle(new GetPlayListsByUserIdQuery(owner.Id, Name: null, PageNumber: 1, PageSize: 10, ViewerId: 999), TestContext.Current.CancellationToken);
            var playList = Assert.Single(result.Items);
            Assert.Equal("Public one", playList.Name);
        }

        [Fact]
        public async Task Handle_Owner_SeesPrivatePlayLists()
        {
            var owner = TestEntities.User();
            await SeedAsync(
                owner,
                TestEntities.PlayList(owner.Id, "Public one", visibility: PlayListVisibility.Public),
                TestEntities.PlayList(owner.Id, "Private one", visibility: PlayListVisibility.Private));

            var result = await CreateHandler().Handle(new GetPlayListsByUserIdQuery(owner.Id, Name: null, PageNumber: 1, PageSize: 10, ViewerId: owner.Id), TestContext.Current.CancellationToken);
            Assert.Equal(2, result.Items.Count);
        }

        [Fact]
        public async Task Handle_NameFilter_ReturnsOnlyMatchingPlayLists()
        {
            var owner = TestEntities.User();
            await SeedAsync(owner, TestEntities.PlayList(owner.Id, "Road Trip"), TestEntities.PlayList(owner.Id, "Study Focus"));

            var result = await CreateHandler().Handle(new GetPlayListsByUserIdQuery(owner.Id, Name: "road", PageNumber: 1, PageSize: 10, ViewerId: owner.Id), TestContext.Current.CancellationToken);
            var playList = Assert.Single(result.Items);
            Assert.Equal("Road Trip", playList.Name);
        }
    }
}