Add some tests

osu.Game.Tests/Visual/Gameplay/TestSceneKeysPerSecondCounter.cs

@@ -1,10 +1,75 @@
 // 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.Framework.Testing;
+using osu.Game.Screens.Play;
+using osu.Game.Screens.Play.HUD;
+using osuTK;
+using osuTK.Input;
+
 namespace osu.Game.Tests.Visual.Gameplay
 {
-    public class TestSceneKeysPerSecondCounter
+    public class TestSceneKeysPerSecondCounter : OsuManualInputManagerTestScene
     {
+        private KeysPerSecondCounter counter;
 
+        [SetUpSteps]
+        public void Setup()
+        {
+            createCounter();
+        }
+
+        private void createCounter() => AddStep("Create counter", () =>
+        {
+            Child = counter = new KeysPerSecondCounter
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                Scale = new Vector2(5)
+            };
+        });
+
+        [Test]
+        public void TestManualTrigger()
+        {
+            AddAssert("Counter = 0", () => counter.Current.Value == 0);
+            AddRepeatStep("manual trigger", KeysPerSecondCounter.AddTimestamp, 20);
+            AddAssert("Counter is not 0", () => counter.Current.Value > 0);
+        }
+
+        [Test]
+        public void TestKpsAsideKeyCounter()
+        {
+            AddStep("Create key counter display", () =>
+                Add(new KeyCounterDisplay
+                {
+                    Origin = Anchor.BottomCentre,
+                    Anchor = Anchor.BottomCentre,
+                    Y = 100,
+                    Children = new KeyCounter[]
+                    {
+                        new KeyCounterKeyboard(Key.W),
+                        new KeyCounterKeyboard(Key.X),
+                        new KeyCounterKeyboard(Key.C),
+                        new KeyCounterKeyboard(Key.V)
+                    }
+                })
+            );
+            AddAssert("Counter = 0", () => counter.Current.Value == 0);
+            addPressKeyStep(Key.W);
+            addPressKeyStep(Key.X);
+            addPressKeyStep(Key.C);
+            addPressKeyStep(Key.V);
+            AddAssert("Counter = 4", () => counter.Current.Value == 4);
+        }
+
+        private void addPressKeyStep(Key key)
+        {
+            AddStep($"Press {key} key", () => InputManager.Key(key));
+        }
     }
 }