diff --git a/packages/cultmath/tests/CultMath.Tests/BatchMathTests.cs b/packages/cultmath/tests/CultMath.Tests/BatchMathTests.cs
index c5196154..3db3259c 100644
--- a/packages/cultmath/tests/CultMath.Tests/BatchMathTests.cs
+++ b/packages/cultmath/tests/CultMath.Tests/BatchMathTests.cs
@@ -338,6 +338,18 @@ public sealed class BatchMathTests
             BatchMath.IntegrateSemiImplicitEuler2D(0.0f, dynamicMask, position, velocity, acceleration));
     }
 
+    [Fact]
+    public void Float2EulerIntegrationValidatesEqualSpanLengths()
+    {
+        var dynamicMask = new float[3];
+        var position = new float2[3];
+        var velocity = new float2[2];
+        var acceleration = new float2[3];
+
+        Assert.Throws<ArgumentException>(() =>
+            BatchMath.IntegrateSemiImplicitEuler2D(0.5f, dynamicMask, position, velocity, acceleration));
+    }
+
     [Fact]
     public void Float2RadialFalloffValidatesEqualSpanLengths()
     {
diff --git a/packages/cultmath/tests/CultMath.Tests/FirstOrderInterceptTests.cs b/packages/cultmath/tests/CultMath.Tests/FirstOrderInterceptTests.cs
index 91591645..a211d266 100644
--- a/packages/cultmath/tests/CultMath.Tests/FirstOrderInterceptTests.cs
+++ b/packages/cultmath/tests/CultMath.Tests/FirstOrderInterceptTests.cs
@@ -24,7 +24,7 @@ namespace CultMath.Tests;
 // determinant > 0 with both roots <= 0 => 0 (via max(t2, 0)).
 public sealed class FirstOrderInterceptTests
 {
-    private const float Precision = 4;
+    private const int Precision = 4;
 
     [Fact]
     public void ZeroRelativeVelocityReturnsZeroTime()