2 files changed, 236 insertions, 0 deletions
diff --git a/tests/Jellyfin.Server.Implementations.Tests/SyncPlay/GroupTests.cs b/tests/Jellyfin.Server.Implementations.Tests/SyncPlay/GroupTests.cs
new file mode 100644
index 0000000000..bd9e680cd9
--- /dev/null
+++ b/tests/Jellyfin.Server.Implementations.Tests/SyncPlay/GroupTests.cs
@@ -0,0 +1,80 @@
+using System;
+using System.Collections.Generic;
+using Emby.Server.Implementations.SyncPlay;
+using Jellyfin.Database.Implementations.Entities;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Session;
+using Microsoft.Extensions.Logging;
+using Moq;
+using Xunit;
+
+namespace Jellyfin.Server.Implementations.Tests.SyncPlay;
+
+public class GroupTests
+{
+    public GroupTests()
+    {
+        var mockLogger = new Mock<ILogger<Emby.Server.Implementations.SyncPlay.Group>>();
+        MockLoggerFactory = new Mock<ILoggerFactory>();
+        MockLoggerFactory.Setup(x => x.CreateLogger(It.IsAny<string>())).Returns(mockLogger.Object);
+
+        MockUserManager = new Mock<IUserManager>();
+        MockSessionManager = new Mock<ISessionManager>();
+        MockLibraryManager = new Mock<ILibraryManager>();
+        MockItem = new Mock<BaseItem>();
+        MockItem.Setup(i => i.IsVisibleStandalone(It.IsAny<User>())).Returns(true);
+    }
+
+    private Mock<ILoggerFactory> MockLoggerFactory { get; }
+
+    private Mock<IUserManager> MockUserManager { get; }
+
+    private Mock<ISessionManager> MockSessionManager { get; }
+
+    private Mock<ILibraryManager> MockLibraryManager { get; }
+
+    private Mock<BaseItem> MockItem { get; }
+
+    [Fact]
+    public void HasAccessToPlayQueue_ReturnsTrue_WhenItemsAreVisible()
+    {
+        MockLibraryManager.Setup(m => m.GetItemById(It.IsAny<Guid>())).Returns(MockItem.Object);
+
+        var group = new Emby.Server.Implementations.SyncPlay.Group(MockLoggerFactory.Object, MockUserManager.Object, MockSessionManager.Object, MockLibraryManager.Object);
+        var itemId = Guid.NewGuid();
+        var playlist = new List<Guid> { itemId };
+        group.PlayQueue.Reset();
+        group.PlayQueue.SetPlaylist(playlist);
+
+        Assert.Single(group.PlayQueue.GetPlaylist());
+        Assert.Equal(itemId, group.PlayQueue.GetPlaylist()[0].ItemId);
+
+        var user = new User("test-user", "auth-provider", "pwdreset-provider");
+        var result = group.HasAccessToPlayQueue(user);
+
+        Assert.True(result);
+    }
+
+    [Fact]
+    public void HasAccessToPlayQueue_ReturnsFalse_WhenLibraryReturnsNullForItem()
+    {
+        MockLibraryManager.Setup(m => m.GetItemById(It.IsAny<Guid>())).Returns((BaseItem?)null);
+
+        Assert.Null(MockLibraryManager.Object.GetItemById(Guid.NewGuid()));
+
+        var group = new Emby.Server.Implementations.SyncPlay.Group(MockLoggerFactory.Object, MockUserManager.Object, MockSessionManager.Object, MockLibraryManager.Object);
+        var itemId = Guid.NewGuid();
+        var playlist = new List<Guid> { itemId };
+        group.PlayQueue.Reset();
+        group.PlayQueue.SetPlaylist(playlist);
+
+        Assert.Single(group.PlayQueue.GetPlaylist());
+        Assert.Equal(itemId, group.PlayQueue.GetPlaylist()[0].ItemId);
+
+        var user = new User("test-user", "auth-provider", "pwdreset-provider");
+        var result = group.HasAccessToPlayQueue(user);
+
+        Assert.False(result);
+    }
+}
diff --git a/tests/Jellyfin.Server.Implementations.Tests/SyncPlay/PlayQueueManagerTests.cs b/tests/Jellyfin.Server.Implementations.Tests/SyncPlay/PlayQueueManagerTests.cs
new file mode 100644
index 0000000000..32685556b2
--- /dev/null
+++ b/tests/Jellyfin.Server.Implementations.Tests/SyncPlay/PlayQueueManagerTests.cs
@@ -0,0 +1,156 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using MediaBrowser.Controller.SyncPlay.Queue;
+using MediaBrowser.Model.SyncPlay;
+using Xunit;
+
+namespace Jellyfin.Server.Implementations.Tests.SyncPlay;
+
+public class PlayQueueManagerTests
+{
+    private static PlayQueueManager CreateQueue(int itemCount)
+    {
+        var items = Enumerable.Range(0, itemCount).Select(_ => Guid.NewGuid()).ToList();
+        var queue = new PlayQueueManager();
+        queue.SetPlaylist(items);
+        return queue;
+    }
+
+    [Fact]
+    public void RemoveFromPlaylist_PlayingItemAndPrecedingItemRemoved_PicksPreviousItem()
+    {
+        var queue = CreateQueue(5);
+        queue.SetPlayingItemByIndex(3);
+
+        var playlist = queue.GetPlaylist();
+        var expectedItemId = playlist[2].ItemId;
+        var toRemove = new List<Guid> { playlist[0].PlaylistItemId, playlist[3].PlaylistItemId };
+        var playingItemRemoved = queue.RemoveFromPlaylist(toRemove);
+
+        Assert.True(playingItemRemoved);
+        Assert.Equal(3, queue.GetPlaylist().Count);
+        Assert.Equal(1, queue.PlayingItemIndex);
+        Assert.Equal(expectedItemId, queue.GetPlayingItemId());
+    }
+
+    [Fact]
+    public void RemoveFromPlaylist_PlayingItemAndAllPrecedingItemsRemoved_PicksFirstRemainingItem()
+    {
+        var queue = CreateQueue(3);
+        queue.SetPlayingItemByIndex(2);
+
+        var playlist = queue.GetPlaylist();
+        var expectedItemId = playlist[1].ItemId;
+        var toRemove = new List<Guid> { playlist[0].PlaylistItemId, playlist[2].PlaylistItemId };
+        var playingItemRemoved = queue.RemoveFromPlaylist(toRemove);
+
+        Assert.True(playingItemRemoved);
+        Assert.Single(queue.GetPlaylist());
+        Assert.Equal(0, queue.PlayingItemIndex);
+        Assert.Equal(expectedItemId, queue.GetPlayingItemId());
+    }
+
+    [Fact]
+    public void RemoveFromPlaylist_AllItemsRemoved_ResetsPlayingItem()
+    {
+        var queue = CreateQueue(2);
+        queue.SetPlayingItemByIndex(1);
+
+        var toRemove = queue.GetPlaylist().Select(item => item.PlaylistItemId).ToList();
+        var playingItemRemoved = queue.RemoveFromPlaylist(toRemove);
+
+        Assert.True(playingItemRemoved);
+        Assert.Empty(queue.GetPlaylist());
+        Assert.False(queue.IsItemPlaying());
+        Assert.Equal(Guid.Empty, queue.GetPlayingItemPlaylistId());
+    }
+
+    [Fact]
+    public void RemoveFromPlaylist_ShuffleMode_PicksPreviousItem()
+    {
+        var queue = CreateQueue(5);
+        queue.SetShuffleMode(GroupShuffleMode.Shuffle);
+        queue.SetPlayingItemByIndex(3);
+
+        var playlist = queue.GetPlaylist();
+        var expectedItemId = playlist[2].ItemId;
+        var toRemove = new List<Guid> { playlist[0].PlaylistItemId, playlist[3].PlaylistItemId };
+        var playingItemRemoved = queue.RemoveFromPlaylist(toRemove);
+
+        Assert.True(playingItemRemoved);
+        Assert.Equal(3, queue.GetPlaylist().Count);
+        Assert.Equal(1, queue.PlayingItemIndex);
+        Assert.Equal(expectedItemId, queue.GetPlayingItemId());
+    }
+
+    [Fact]
+    public void RemoveFromPlaylist_PlayingItemNotRemoved_RestoresPlayingItem()
+    {
+        var queue = CreateQueue(3);
+        queue.SetPlayingItemByIndex(2);
+
+        var playlist = queue.GetPlaylist();
+        var expectedItemId = playlist[2].ItemId;
+        var toRemove = new List<Guid> { playlist[0].PlaylistItemId };
+        var playingItemRemoved = queue.RemoveFromPlaylist(toRemove);
+
+        Assert.False(playingItemRemoved);
+        Assert.Equal(1, queue.PlayingItemIndex);
+        Assert.Equal(expectedItemId, queue.GetPlayingItemId());
+    }
+
+    [Theory]
+    [InlineData(GroupRepeatMode.RepeatNone)]
+    [InlineData(GroupRepeatMode.RepeatOne)]
+    [InlineData(GroupRepeatMode.RepeatAll)]
+    public void Next_EmptyPlaylist_ReturnsFalse(GroupRepeatMode repeatMode)
+    {
+        var queue = new PlayQueueManager();
+        queue.SetRepeatMode(repeatMode);
+
+        Assert.False(queue.Next());
+        Assert.False(queue.IsItemPlaying());
+        Assert.Equal(Guid.Empty, queue.GetPlayingItemPlaylistId());
+    }
+
+    [Theory]
+    [InlineData(GroupRepeatMode.RepeatNone)]
+    [InlineData(GroupRepeatMode.RepeatOne)]
+    [InlineData(GroupRepeatMode.RepeatAll)]
+    public void Previous_EmptyPlaylist_ReturnsFalse(GroupRepeatMode repeatMode)
+    {
+        var queue = new PlayQueueManager();
+        queue.SetRepeatMode(repeatMode);
+
+        Assert.False(queue.Previous());
+        Assert.False(queue.IsItemPlaying());
+        Assert.Equal(Guid.Empty, queue.GetPlayingItemPlaylistId());
+    }
+
+    [Theory]
+    [InlineData(-1)]
+    [InlineData(2)]
+    [InlineData(3)]
+    public void SetPlayingItemByIndex_OutOfBounds_ResetsPlayingItem(int playlistIndex)
+    {
+        var queue = CreateQueue(2);
+
+        queue.SetPlayingItemByIndex(playlistIndex);
+
+        Assert.False(queue.IsItemPlaying());
+        Assert.Equal(Guid.Empty, queue.GetPlayingItemPlaylistId());
+    }
+
+    [Fact]
+    public void SetPlayingItemByIndex_InBounds_SetsPlayingItem()
+    {
+        var queue = CreateQueue(2);
+        var expectedItemId = queue.GetPlaylist()[1].ItemId;
+
+        queue.SetPlayingItemByIndex(1);
+
+        Assert.True(queue.IsItemPlaying());
+        Assert.Equal(expectedItemId, queue.GetPlayingItemId());
+    }
+}