Add tests for audio book resolving

tests/Jellyfin.Server.Implementations.Tests/Library/AudioResolverTests.cs

@@ -0,0 +1,73 @@
+using System.Linq;
+using Emby.Naming.Common;
+using Emby.Server.Implementations.Library.Resolvers.Audio;
+using MediaBrowser.Controller.Entities.Audio;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Model.IO;
+using Moq;
+using Xunit;
+
+namespace Jellyfin.Server.Implementations.Tests.Library;
+
+public class AudioResolverTests
+{
+    private static readonly NamingOptions _namingOptions = new();
+
+    [Theory]
+    [InlineData("words.mp3")] // single non-tagged file
+    [InlineData("chapter 01.mp3")]
+    [InlineData("part 1.mp3")]
+    [InlineData("chapter 01.mp3", "non-media.txt")]
+    [InlineData("title.mp3", "title.epub")]
+    [InlineData("01.mp3", "subdirectory/")] // single media file with sub-directory - note that this will hide any contents in the subdirectory
+    public void Resolve_AudiobookDirectory_SingleResult(params string[] children)
+    {
+        var resolved = TestResolveChildren("/parent/title", children);
+        Assert.NotNull(resolved);
+    }
+
+    [Theory]
+    /* Results that can't be displayed as an audio book. */
+    [InlineData] // no contents
+    [InlineData("subdirectory/")]
+    [InlineData("non-media.txt")]
+    /* Names don't indicate parts of a single book. */
+    [InlineData("Name.mp3", "Another Name.mp3")]
+    /* Results that are an audio book but not currently navigable as such (multiple chapters and/or parts). */
+    [InlineData("01.mp3", "02.mp3")]
+    [InlineData("chapter 01.mp3", "chapter 02.mp3")]
+    [InlineData("part 1.mp3", "part 2.mp3")]
+    [InlineData("chapter 01 part 01.mp3", "chapter 01 part 02.mp3")]
+    /* Mismatched chapters, parts, and named files. */
+    [InlineData("chapter 01.mp3", "part 2.mp3")]
+    public void Resolve_AudiobookDirectory_NoResult(params string[] children)
+    {
+        var resolved = TestResolveChildren("/parent/book title", children);
+        Assert.Null(resolved);
+    }
+
+    private Audio? TestResolveChildren(string parent, string[] children)
+    {
+        var childrenMetadata = children.Select(name => new FileSystemMetadata
+        {
+            FullName = parent + "/" + name,
+            IsDirectory = name.EndsWith('/')
+        }).ToArray();
+
+        var resolver = new AudioResolver(_namingOptions);
+        var itemResolveArgs = new ItemResolveArgs(
+            null,
+            Mock.Of<ILibraryManager>())
+        {
+            CollectionType = "books",
+            FileInfo = new FileSystemMetadata
+            {
+                FullName = parent,
+                IsDirectory = true
+            },
+            FileSystemChildren = childrenMetadata
+        };
+
+        return resolver.Resolve(itemResolveArgs);
+    }
+}