Actualize QuitButton visual test

osu.Game.Tests/Visual/TestCaseQuitButton.cs

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+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Screens.Play.HUD;
+
+namespace osu.Game.Tests.Visual
+{
+    [Description("'Hold to Quit' UI element")]
+    public class TestCaseQuitButton : OsuTestCase
+    {
+        private readonly QuitButton quitButton;
+        private Drawable innerButton => quitButton.Children.Single(child => child is CircularContainer);
+        private bool exitAction;
+
+        public TestCaseQuitButton()
+        {
+            Add(quitButton = new QuitButton
+            {
+                Origin = Anchor.BottomRight,
+                Anchor = Anchor.BottomRight,
+            });
+            quitButton.ExitAction = () => exitAction = true;
+
+            var text = quitButton.Children.OfType<SpriteText>().Single();
+
+            AddStep("Trigger text fade in/out", () =>
+            {
+                exitAction = false;
+
+                innerButton.TriggerOnMouseDown();
+                innerButton.TriggerOnMouseUp();
+            });
+
+            AddUntilStep(() => text.IsPresent && !exitAction, "Text visible");
+            AddUntilStep(() => !text.IsPresent && !exitAction, "Text is not visible");
+
+            AddStep("Trigger exit action", () =>
+            {
+                exitAction = false;
+                innerButton.TriggerOnMouseDown();
+            });
+
+            AddUntilStep(() => exitAction, $"{nameof(quitButton.ExitAction)} was triggered");
+        }
+    }
+}