add tests

osu.Game.Rulesets.Osu.Tests/Class1.cs

@@ -0,0 +1,23 @@
+// 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.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Game.Rulesets.Osu.Mods;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    [TestFixture]
+    public class TestSceneSpinnerSpunOut : TestSceneSpinner
+    {
+        public override IReadOnlyList<Type> RequiredTypes => base.RequiredTypes.Concat(new[] { typeof(OsuModSpunOut) }).ToList();
+
+        [SetUp]
+        public void SetUp() => Schedule(() =>
+        {
+            SelectedMods.Value = new[] { new OsuModHidden() };
+        });
+    }
+}

osu.Game.Rulesets.Osu/Mods/OsuModSpunOut.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Mods;