From 6399f7e3db1645d6d9ea4a2cf3c083a77169d1c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bart=C5=82omiej=20Dach?= <dach.bartlomiej@gmail.com>
Date: Wed, 3 Sep 2025 08:59:33 +0200
Subject: [PATCH] Add failing test case

---
 osu.Game.Tests/Skins/IO/ImportSkinTest.cs | 33 +++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/osu.Game.Tests/Skins/IO/ImportSkinTest.cs b/osu.Game.Tests/Skins/IO/ImportSkinTest.cs
index 62e7a80435..66e286cf4f 100644
--- a/osu.Game.Tests/Skins/IO/ImportSkinTest.cs
+++ b/osu.Game.Tests/Skins/IO/ImportSkinTest.cs
@@ -294,6 +294,39 @@ namespace osu.Game.Tests.Skins.IO
 
         #endregion
 
+        /// <remarks>
+        /// Note that this test passing / failing is platform / OS-specific (if it is to fail, it'll fail on windows).
+        /// </remarks>
+        [Test]
+        public async Task TestExternallyMountingImportWithInvalidFilename()
+        {
+            using (HeadlessGameHost host = new CleanRunHeadlessGameHost())
+            {
+                try
+                {
+                    var osu = LoadOsuIntoHost(host);
+
+                    var zipStream = new MemoryStream();
+                    using var zip = ZipArchive.Create();
+                    zip.AddEntry("test?.png", new MemoryStream(new byte[] { 0xDE, 0xAD, 0xBE, 0xEF }));
+                    zip.SaveTo(zipStream);
+
+                    var import = await loadSkinIntoOsu(osu, new ImportTask(zipStream, "test skin.osk"));
+
+                    var skinManager = osu.Dependencies.Get<SkinManager>();
+                    var externalEdit = await skinManager.BeginExternalEditing(import.PerformRead(s => s.Detach())); // should not fail
+
+                    Task finishTask = Task.CompletedTask;
+                    host.UpdateThread.Scheduler.Add(() => finishTask = externalEdit.Finish());
+                    await finishTask;
+                }
+                finally
+                {
+                    host.Exit();
+                }
+            }
+        }
+
         private void assertCorrectMetadata(Live<SkinInfo> import1, string name, string creator, decimal version, OsuGameBase osu)
         {
             import1.PerformRead(i =>