diff --git a/Assets/_Project/Tests/EditMode/AnimParamMathTests.cs b/Assets/_Project/Tests/EditMode/AnimParamMathTests.cs
index 150cdb98e..742e40d66 100644
--- a/Assets/_Project/Tests/EditMode/AnimParamMathTests.cs
+++ b/Assets/_Project/Tests/EditMode/AnimParamMathTests.cs
@@ -73,5 +73,32 @@ namespace ProjectM.Tests
             Assert.IsFalse(float.IsNaN(r.x) || float.IsNaN(r.y) || float.IsNaN(r.z));
             Assert.AreEqual(1f, r.z, Eps); // clamps to 1
         }
+
+        // ---- PlanarForward (enemy facing from replicated LocalTransform.Rotation) ----
+
+        [Test] public void PlanarForward_Identity_IsWorldForward()
+        {
+            var f = AnimParamMath.PlanarForward(quaternion.identity);
+            Assert.AreEqual(0f, f.x, Eps); Assert.AreEqual(1f, f.y, Eps);
+        }
+
+        [Test] public void PlanarForward_Yaw180_IsBackward()
+        {
+            var f = AnimParamMath.PlanarForward(quaternion.RotateY(math.radians(180f)));
+            Assert.AreEqual(0f, f.x, Eps); Assert.AreEqual(-1f, f.y, Eps);
+        }
+
+        [Test] public void PlanarForward_PitchedToVertical_FallsBackToWorldForward()
+        {
+            // forward rotated to point straight down -> planar XZ ~ 0 -> degenerate fallback (0,1).
+            var f = AnimParamMath.PlanarForward(quaternion.RotateX(math.radians(90f)));
+            Assert.AreEqual(0f, f.x, Eps); Assert.AreEqual(1f, f.y, Eps);
+        }
+
+        [Test] public void PlanarForward_IsNormalized()
+        {
+            var f = AnimParamMath.PlanarForward(quaternion.RotateY(math.radians(37f)));
+            Assert.AreEqual(1f, math.length(f), Eps);
+        }
     }
 }