From 28be079779d4508b5ab2a2fd4b482f3fd929ced5 Mon Sep 17 00:00:00 2001
From: orut34iop <orut34iop@users.noreply.github.com>
Date: Tue, 15 Sep 2026 11:16:56 -0400
Subject: Backport pull request #18006 from jellyfin/release-12.z

Preserve active scans when requesting a background library refresh

Original-merge: 949e0585a65a91f90644a2475c1e1009e5d51e90

Merged-by: crobibero <cody@robibe.ro>

Backported-by: Cody Robibero <cody@robibe.ro>
---
 .../Library/LibraryManagerScanTests.cs             | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManagerScanTests.cs

(limited to 'tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManagerScanTests.cs')

diff --git a/tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManagerScanTests.cs b/tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManagerScanTests.cs
new file mode 100644
index 0000000000..6d0c491382
--- /dev/null
+++ b/tests/Jellyfin.Server.Implementations.Tests/Library/LibraryManagerScanTests.cs
@@ -0,0 +1,55 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using AutoFixture;
+using AutoFixture.AutoMoq;
+using Emby.Naming.Common;
+using Emby.Server.Implementations.ScheduledTasks.Tasks;
+using MediaBrowser.Controller.Configuration;
+using MediaBrowser.Model.Configuration;
+using MediaBrowser.Model.Tasks;
+using Moq;
+using Xunit;
+using ServerLibraryManager = Emby.Server.Implementations.Library.LibraryManager;
+
+namespace Jellyfin.Server.Implementations.Tests.Library;
+
+public class LibraryManagerScanTests
+{
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public async Task StartScanInBackground_QueuesOnlyWhenIdle(bool scanRunning)
+    {
+        var fixture = new Fixture().Customize(new AutoMoqCustomization());
+        fixture.Register(() => new NamingOptions());
+        var configuration = fixture.Freeze<Mock<IServerConfigurationManager>>();
+        configuration.Setup(c => c.Configuration).Returns(new ServerConfiguration());
+        configuration.Setup(c => c.ApplicationPaths.ProgramDataPath).Returns("/data");
+        var tasks = fixture.Freeze<Mock<ITaskManager>>();
+        var manager = fixture.Create<ServerLibraryManager>();
+        typeof(ServerLibraryManager).GetProperty(nameof(ServerLibraryManager.IsScanRunning))!.SetValue(manager, scanRunning);
+
+        await manager.StartScanInBackground().ConfigureAwait(true);
+
+        tasks.Verify(t => t.QueueScheduledTask<RefreshMediaLibraryTask>(), scanRunning ? Times.Never() : Times.Once());
+        tasks.Verify(t => t.CancelIfRunningAndQueue<RefreshMediaLibraryTask>(), Times.Never());
+    }
+
+    [Fact]
+    public async Task ValidateMediaLibrary_RestartsScheduledScan()
+    {
+        var fixture = new Fixture().Customize(new AutoMoqCustomization());
+        fixture.Register(() => new NamingOptions());
+        var configuration = fixture.Freeze<Mock<IServerConfigurationManager>>();
+        configuration.Setup(c => c.Configuration).Returns(new ServerConfiguration());
+        configuration.Setup(c => c.ApplicationPaths.ProgramDataPath).Returns("/data");
+        var tasks = fixture.Freeze<Mock<ITaskManager>>();
+        var manager = fixture.Create<ServerLibraryManager>();
+
+        await manager.ValidateMediaLibrary(new Progress<double>(), CancellationToken.None).ConfigureAwait(true);
+
+        tasks.Verify(t => t.CancelIfRunningAndQueue<RefreshMediaLibraryTask>(), Times.Once());
+        tasks.Verify(t => t.QueueScheduledTask<RefreshMediaLibraryTask>(), Times.Never());
+    }
+}
-- 
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