Add catch placement blueprint visual test scenes (without tests)

osu.Game.Rulesets.Catch.Tests/Editor/CatchPlacementBlueprintTestScene.cs

@@ -0,0 +1,45 @@
+// 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 osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Timing;
+using osu.Game.Rulesets.Edit;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.UI.Scrolling;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Rulesets.Catch.Tests.Editor
+{
+    public abstract class CatchPlacementBlueprintTestScene : PlacementBlueprintTestScene
+    {
+        protected new ScrollingHitObjectContainer HitObjectContainer => contentContainer.Playfield.HitObjectContainer;
+
+        protected override Container<Drawable> Content => contentContainer;
+
+        private readonly CatchEditorTestSceneContainer contentContainer;
+
+        protected CatchPlacementBlueprintTestScene()
+        {
+            base.Content.Add(contentContainer = new CatchEditorTestSceneContainer
+            {
+                Clock = new FramedClock(new ManualClock())
+            });
+        }
+
+        // Unused because AddHitObject is overriden
+        protected override Container CreateHitObjectContainer() => new Container();
+
+        protected override void AddHitObject(DrawableHitObject hitObject)
+        {
+            contentContainer.Playfield.HitObjectContainer.Add(hitObject);
+        }
+
+        protected override SnapResult SnapForBlueprint(PlacementBlueprint blueprint)
+        {
+            var result = base.SnapForBlueprint(blueprint);
+            result.Time = HitObjectContainer.TimeAtScreenSpacePosition(result.ScreenSpacePosition);
+            return result;
+        }
+    }
+}