diff --git a/tests/AcDream.Runtime.Tests/Gameplay/PlayerMovementControllerTests.cs b/tests/AcDream.Runtime.Tests/Gameplay/PlayerMovementControllerTests.cs
index 492c18e1..478c951a 100644
--- a/tests/AcDream.Runtime.Tests/Gameplay/PlayerMovementControllerTests.cs
+++ b/tests/AcDream.Runtime.Tests/Gameplay/PlayerMovementControllerTests.cs
@@ -652,9 +652,16 @@ public class PlayerMovementControllerTests
             PhysicsBody.MaxQuantum + PhysicsBody.MinQuantum,
             new MovementInput(Forward: true));
 
-        Assert.Equal(result.Position.X, result.RenderPosition.X, precision: 4);
-        Assert.Equal(result.Position.Y, result.RenderPosition.Y, precision: 4);
-        Assert.Equal(result.Position.Z, result.RenderPosition.Z, precision: 4);
+        // Tolerance, not decimal `precision:` — the AP-7 friction port (P2)
+        // shifts the velocity-fallback trajectory by micrometers, and
+        // Math.Round-based precision comparison fails when two essentially
+        // equal values straddle a 5e-5 rounding boundary (observed: X
+        // 96.3427505 vs 96.3427429 — a 7.6 µm gap rounding to 96.3428 vs
+        // 96.3427). The clamp contract is "render == physics for
+        // presentation"; 1 mm is far below visibility and boundary-immune.
+        Assert.Equal(result.Position.X, result.RenderPosition.X, tolerance: 1e-3f);
+        Assert.Equal(result.Position.Y, result.RenderPosition.Y, tolerance: 1e-3f);
+        Assert.Equal(result.Position.Z, result.RenderPosition.Z, tolerance: 1e-3f);
     }
 
     [Fact]