1 files changed, 96 insertions, 0 deletions
diff --git a/tests/Jellyfin.Providers.Tests/MediaInfo/SubtitleResolverTests.cs b/tests/Jellyfin.Providers.Tests/MediaInfo/SubtitleResolverTests.cs
new file mode 100644
index 000000000..b160e676e
--- /dev/null
+++ b/tests/Jellyfin.Providers.Tests/MediaInfo/SubtitleResolverTests.cs
@@ -0,0 +1,96 @@
+#pragma warning disable CA1002 // Do not expose generic lists
+
+using System.Collections.Generic;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Globalization;
+using MediaBrowser.Providers.MediaInfo;
+using Moq;
+using Xunit;
+
+namespace Jellyfin.Providers.Tests.MediaInfo
+{
+    public class SubtitleResolverTests
+    {
+        public static IEnumerable<object[]> AddExternalSubtitleStreams_GivenMixedFilenames_ReturnsValidSubtitles_TestData()
+        {
+            var index = 0;
+            yield return new object[]
+            {
+                new List<MediaStream>(),
+                "/video/My.Video.mkv",
+                index,
+                new[]
+                {
+                    "/video/My.Video.mp3",
+                    "/video/My.Video.png",
+                    "/video/My.Video.srt",
+                    "/video/My.Video.txt",
+                    "/video/My.Video.vtt",
+                    "/video/My.Video.ass",
+                    "/video/My.Video.sub",
+                    "/video/My.Video.ssa",
+                    "/video/My.Video.smi",
+                    "/video/My.Video.sami",
+                    "/video/My.Video.en.srt",
+                    "/video/My.Video.default.en.srt",
+                    "/video/My.Video.default.forced.en.srt",
+                    "/video/My.Video.en.default.forced.srt",
+                    "/video/My.Video.With.Additional.Garbage.en.srt",
+                    "/video/My.Video With Additional Garbage.srt"
+                },
+                new[]
+                {
+                    CreateMediaStream("/video/My.Video.srt", "srt", null, index++),
+                    CreateMediaStream("/video/My.Video.vtt", "vtt", null, index++),
+                    CreateMediaStream("/video/My.Video.ass", "ass", null, index++),
+                    CreateMediaStream("/video/My.Video.sub", "sub", null, index++),
+                    CreateMediaStream("/video/My.Video.ssa", "ssa", null, index++),
+                    CreateMediaStream("/video/My.Video.smi", "smi", null, index++),
+                    CreateMediaStream("/video/My.Video.sami", "sami", null, index++),
+                    CreateMediaStream("/video/My.Video.en.srt", "srt", "en", index++),
+                    CreateMediaStream("/video/My.Video.default.en.srt", "srt", "en", index++, isDefault: true),
+                    CreateMediaStream("/video/My.Video.default.forced.en.srt", "srt", "en", index++, isForced: true, isDefault: true),
+                    CreateMediaStream("/video/My.Video.en.default.forced.srt", "srt", "en", index++, isForced: true, isDefault: true),
+                    CreateMediaStream("/video/My.Video.With.Additional.Garbage.en.srt", "srt", "en", index),
+                }
+            };
+        }
+
+        [Theory]
+        [MemberData(nameof(AddExternalSubtitleStreams_GivenMixedFilenames_ReturnsValidSubtitles_TestData))]
+        public void AddExternalSubtitleStreams_GivenMixedFilenames_ReturnsValidSubtitles(List<MediaStream> streams, string videoPath, int startIndex, string[] files, MediaStream[] expectedResult)
+        {
+            new SubtitleResolver(Mock.Of<ILocalizationManager>()).AddExternalSubtitleStreams(streams, videoPath, startIndex, files);
+
+            Assert.Equal(expectedResult.Length, streams.Count);
+            for (var i = 0; i < expectedResult.Length; i++)
+            {
+                var expected = expectedResult[i];
+                var actual = streams[i];
+
+                Assert.Equal(expected.Index, actual.Index);
+                Assert.Equal(expected.Type, actual.Type);
+                Assert.Equal(expected.IsExternal, actual.IsExternal);
+                Assert.Equal(expected.Path, actual.Path);
+                Assert.Equal(expected.IsDefault, actual.IsDefault);
+                Assert.Equal(expected.IsForced, actual.IsForced);
+                Assert.Equal(expected.Language, actual.Language);
+            }
+        }
+
+        private static MediaStream CreateMediaStream(string path, string codec, string? language, int index, bool isForced = false, bool isDefault = false)
+        {
+            return new ()
+            {
+                Index = index,
+                Codec = codec,
+                Type = MediaStreamType.Subtitle,
+                IsExternal = true,
+                Path = path,
+                IsDefault = isDefault,
+                IsForced = isForced,
+                Language = language
+            };
+        }
+    }
+}