Add test coverage of startup ruleset being non-default

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

@@ -0,0 +1,32 @@
+// 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 NUnit.Framework;
+using osu.Framework.Development;
+using osu.Game.Configuration;
+
+namespace osu.Game.Tests.Visual.Navigation
+{
+    [TestFixture]
+    public class TestSceneStartupRuleset : OsuGameTestScene
+    {
+        protected override TestOsuGame CreateTestGame()
+        {
+            // Must be done in this function due to the RecycleLocalStorage call just before.
+            var config = DebugUtils.IsDebugBuild
+                ? new DevelopmentOsuConfigManager(LocalStorage)
+                : new OsuConfigManager(LocalStorage);
+
+            config.SetValue(OsuSetting.Ruleset, "mania");
+            config.Save();
+
+            return base.CreateTestGame();
+        }
+
+        [Test]
+        public void TestRulesetConsumed()
+        {
+            AddUntilStep("ruleset correct", () => Game.Ruleset.Value.ShortName == "mania");
+        }
+    }
+}