Added SetUp for new tests.

osu.Game.Tests/Visual/Online/TestSceneChatManipulation.cs

@@ -0,0 +1,74 @@
+// 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.
+
+#nullable disable
+
+using NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
+using osu.Game.Overlays.Chat;
+
+namespace osu.Game.Tests.Visual.Online
+{
+    [TestFixture]
+    public class TestSceneChatManipulation : OsuTestScene
+    {
+        private ChatTextBox box;
+        private OsuSpriteText text;
+
+        [SetUp]
+        public void SetUp()
+        {
+            Schedule(() =>
+            {
+                Children = new Drawable[]
+                {
+                    box = new ChatTextBox
+                    {
+                        Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre,
+                        RelativeSizeAxes = Axes.X,
+                        Width = 0.99f,
+                    },
+                    text = new OsuSpriteText
+                    {
+                        Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre,
+                        RelativeSizeAxes = Axes.X,
+                        Width = 0.99f,
+                        Y = -box.Height,
+                        Font = OsuFont.Default.With(size: 20),
+                    }
+                };
+                box.OnCommit += (_, __) =>
+                {
+                    text.Text = $"{nameof(box.OnCommit)}: {box.Text}";
+                    box.Text = string.Empty;
+                    box.TakeFocus();
+                    text.FadeOutFromOne(1000, Easing.InQuint);
+                };
+            });
+        }
+
+        [Test]
+        public void TestReachingLimitOfMessages()
+        {
+        }
+
+        [Test]
+        public void TestStayOnLastIndex()
+        {
+        }
+
+        [Test]
+        public void TestKeepOriginalMessage()
+        {
+        }
+
+        [Test]
+        public void TestResetIndexOnEmpty()
+        {
+        }
+    }
+}