Make Velocity and TickDistance private set

osu.Game.Rulesets.Osu/Objects/Slider.cs

@@ -92,8 +92,8 @@ public double Distance
         /// </summary>
         public double SpanDuration => Duration / this.SpanCount();
 
-        public double Velocity;
-        public double TickDistance;
+        public double Velocity { get; private set; }
+        public double TickDistance { get; private set; }
 
         /// <summary>
         /// An extra multiplier that affects the number of ticks generated by this <see cref="Slider"/>.

osu.Game.Tests/Visual/TestCaseHitObjectComposer.cs

@@ -49,9 +49,7 @@ private void load()
                             Vector2.Zero,
                             new Vector2(216, 0),
                         },
-                        Distance = 400,
-                        Velocity = 1,
-                        TickDistance = 100,
+                        Distance = 216,
                         Scale = 0.5f,
                     }
                 },