diff --git a/tests/geometry/terrain-mesh.test.ts b/tests/geometry/terrain-mesh.test.ts
index d603c739..b7200bb1 100644
--- a/tests/geometry/terrain-mesh.test.ts
+++ b/tests/geometry/terrain-mesh.test.ts
@@ -56,19 +56,11 @@ function collectTopEdgeKeys(options: {
       options.level.positions[positionOffset + varyingOffset]! /
       options.terrain.cellSize;
     const roundedVaryingSample = Math.round(varyingSample);
-    const maxVaryingSample =
-      options.axis === "x"
-        ? options.terrain.sampleCountZ - 1
-        : options.terrain.sampleCountX - 1;
 
     if (Math.abs(varyingSample - roundedVaryingSample) > epsilon) {
       continue;
     }
 
-    if (roundedVaryingSample === 0 || roundedVaryingSample === maxVaryingSample) {
-      continue;
-    }
-
     const sampleX =
       options.axis === "x"
         ? options.sampleCoordinate
@@ -122,11 +114,19 @@ function collectLoweredEdgeVertexCount(options: {
       options.level.positions[positionOffset + varyingOffset]! /
       options.terrain.cellSize;
     const roundedVaryingSample = Math.round(varyingSample);
+    const maxVaryingSample =
+      options.axis === "x"
+        ? options.terrain.sampleCountZ - 1
+        : options.terrain.sampleCountX - 1;
 
     if (Math.abs(varyingSample - roundedVaryingSample) > epsilon) {
       continue;
     }
 
+    if (roundedVaryingSample === 0 || roundedVaryingSample === maxVaryingSample) {
+      continue;
+    }
+
     const sampleX =
       options.axis === "x"
         ? options.sampleCoordinate