Add test

osu.Game.Tests/Visual/Navigation/TestSceneBeatmapEditor.cs

@@ -0,0 +1,57 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using DeepEqual.Syntax;
+using NUnit.Framework;
+using osu.Framework.Screens;
+using osu.Game.Beatmaps;
+using osu.Game.Screens.Edit;
+using osu.Game.Screens.Menu;
+
+namespace osu.Game.Tests.Visual.Navigation
+{
+    public partial class TestSceneBeatmapEditor : OsuGameTestScene
+    {
+        [Test]
+        public void TestCancelNavigationToEditor()
+        {
+            BeatmapSetInfo[] beatmapSets = Array.Empty<BeatmapSetInfo>();
+
+            AddStep("Timestamp current beatmapsets", () =>
+            {
+                Game.Realm.Run(realm =>
+                {
+                    beatmapSets = realm.All<BeatmapSetInfo>().Where(x => !x.DeletePending).ToArray();
+                });
+            });
+
+            AddStep("Open editor and close it while loading", () =>
+            {
+                var task = Task.Run(async () =>
+                {
+                    await Task.Delay(100);
+                    Game.ScreenStack.CurrentScreen.Exit();
+                });
+
+                Game.ScreenStack.Push(new EditorLoader());
+            });
+
+            AddUntilStep("wait for editor", () => Game.ScreenStack.CurrentScreen is MainMenu);
+
+            BeatmapSetInfo[] currentSetInfos = Array.Empty<BeatmapSetInfo>();
+
+            AddStep("Get current beatmaps", () =>
+            {
+                Game.Realm.Run(realm =>
+                {
+                    currentSetInfos = realm.All<BeatmapSetInfo>().Where(x => !x.DeletePending).ToArray();
+                });
+            });
+
+            AddAssert("dummy beatmap didn't appear", () => currentSetInfos.IsDeepEqual(beatmapSets));
+        }
+    }
+}