Add the test case to test all local .kar file in the test case.

osu.Game.Rulesets.Karaoke.Tests/Integration/Formats/KarFileTest.cs

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+// Copyright (c) andy840119 <[email protected]>. Licensed under the GPL Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.IO;
+using osu.Game.IO.Serialization;
+using osu.Game.Rulesets.Karaoke.Integration.Formats;
+using osu.Game.Rulesets.Karaoke.Tests.Resources;
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Rulesets.Karaoke.Tests.Integration.Formats;
+
+public class KarFileTest
+{
+    private static IEnumerable<string> allKarFileNames => TestResources.GetStore().GetAvailableResources()
+                                                                       .Where(res => res.EndsWith(".kar", StringComparison.Ordinal)).Select(x => Path.GetFileNameWithoutExtension(x!));
+
+    [TestCaseSource(nameof(allKarFileNames))]
+    public void TestDecodeEncodedBeatmap(string fileName)
+    {
+        var decoded = decode(fileName, out var encoded);
+
+        // Note : this test case does not cover ruby property
+        Assert.That(decoded.HitObjects.Count, Is.EqualTo(encoded.HitObjects.Count));
+        Assert.That(encoded.Serialize(), Is.EqualTo(decoded.Serialize()));
+    }
+
+    private static Beatmap decode(string filename, out Beatmap encoded)
+    {
+        using var stream = TestResources.OpenKarResource(filename);
+        using var sr = new LineBufferedReader(stream);
+
+        // Read file and decode to file
+        var legacyDecoded = new Beatmap
+        {
+            HitObjects = new KarDecoder().Decode(sr.ReadToEnd()).OfType<HitObject>().ToList(),
+        };
+
+        using var ms = new MemoryStream();
+        using var sw = new StreamWriter(ms);
+        using var sr2 = new LineBufferedReader(ms);
+
+        // Then encode file to stream
+        string encodeResult = new KarEncoder().Encode(legacyDecoded);
+        sw.WriteLine(encodeResult);
+        sw.Flush();
+
+        ms.Position = 0;
+
+        encoded = new Beatmap
+        {
+            HitObjects = new KarDecoder().Decode(sr2.ReadToEnd()).OfType<HitObject>().ToList(),
+        };
+        return legacyDecoded;
+    }
+}