Test setup

osu.Game.Tests/Visual/Editing/TestSceneTimelineHitObjectBlueprint.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Screens.Edit.Compose.Components.Timeline;
+using osuTK;
+
+namespace osu.Game.Tests.Visual.Editing
+{
+    public class TestSceneTimelineHitObjectBlueprint : TimelineTestScene
+    {
+        private Spinner spinner;
+        private TimelineHitObjectBlueprint blueprint;
+
+        public TestSceneTimelineHitObjectBlueprint()
+        {
+            var spinner = new Spinner
+            {
+                Position = new Vector2(256, 256),
+                StartTime = -1000,
+                EndTime = 2000
+            };
+
+            spinner.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty { CircleSize = 2 });
+            Add(new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                Size = new Vector2(0.5f),
+                Child = _ = new DrawableSpinner(spinner)
+            });
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            Clock.Seek(10000);
+        }
+
+        public override Drawable CreateTestComponent() => blueprint = new TimelineHitObjectBlueprint(spinner);
+
+        [Test]
+        public void TestDisallowZeroLengthSpinners()
+        {
+
+        }
+    }
+}