fix(anim): Phase L.1c animate server-controlled chase

tests/AcDream.Core.Tests/Physics/ServerControlledLocomotionTests.cs

@@ -0,0 +1,52 @@
+using System.Numerics;
+using AcDream.Core.Physics;
+using Xunit;
+
+namespace AcDream.Core.Tests.Physics;
+
+public sealed class ServerControlledLocomotionTests
+{
+    [Fact]
+    public void PlanFromVelocity_StopsBelowRetailNoiseThreshold()
+    {
+        var plan = ServerControlledLocomotion.PlanFromVelocity(
+            new Vector3(0.10f, 0.12f, 3.0f));
+
+        Assert.False(plan.IsMoving);
+        Assert.Equal(MotionCommand.Ready, plan.Motion);
+        Assert.Equal(1.0f, plan.SpeedMod);
+    }
+
+    [Fact]
+    public void PlanFromVelocity_WalksForSlowServerControlledMotion()
+    {
+        var plan = ServerControlledLocomotion.PlanFromVelocity(
+            new Vector3(0.0f, 0.80f, 0.0f));
+
+        Assert.True(plan.IsMoving);
+        Assert.Equal(MotionCommand.WalkForward, plan.Motion);
+        Assert.InRange(plan.SpeedMod, 0.25f, 0.27f);
+    }
+
+    [Fact]
+    public void PlanFromVelocity_RunsAtRetailRunScale()
+    {
+        var plan = ServerControlledLocomotion.PlanFromVelocity(
+            new Vector3(0.0f, MotionInterpreter.RunAnimSpeed, 0.0f));
+
+        Assert.True(plan.IsMoving);
+        Assert.Equal(MotionCommand.RunForward, plan.Motion);
+        Assert.Equal(1.0f, plan.SpeedMod, precision: 4);
+    }
+
+    [Fact]
+    public void PlanFromVelocity_ClampsVeryFastSnapshots()
+    {
+        var plan = ServerControlledLocomotion.PlanFromVelocity(
+            new Vector3(0.0f, 30.0f, 0.0f));
+
+        Assert.True(plan.IsMoving);
+        Assert.Equal(MotionCommand.RunForward, plan.Motion);
+        Assert.Equal(ServerControlledLocomotion.MaxSpeedMod, plan.SpeedMod);
+    }
+}