Visual test for KeyCounter.

Author: huoyaoyuan

osu.Desktop.VisualTests/Tests/TestCaseKeyCounter.cs

@@ -0,0 +1,26 @@
+using System;
+using OpenTK.Input;
+using osu.Framework.GameModes.Testing;
+using osu.Game.Graphics.UserInterface;
+
+namespace osu.Desktop.Tests
+{
+    class TestCaseKeyCounter : TestCase
+    {
+        public override string Name => @"KeyCounter";
+
+        public override string Description => @"Tests key counter";
+
+        public override void Reset()
+        {
+            base.Reset();
+
+            KeyCounter kc = new KeyCounter { IsCounting = true };
+            Add(kc);
+            kc.AddKey(new KeyBoardCount(@"Z", Key.Z));
+            kc.AddKey(new KeyBoardCount(@"X", Key.X));
+            kc.AddKey(new MouseCount(@"M1", MouseButton.Left));
+            kc.AddKey(new MouseCount(@"M2", MouseButton.Right));
+        }
+    }
+}

osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj

@@ -148,6 +148,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Program.cs" />
+    <Compile Include="Tests\TestCaseKeyCounter.cs" />
     <Compile Include="Tests\TestCaseTextAwesome.cs" />
     <Compile Include="VisualTestGame.cs" />
   </ItemGroup>