Update tests for collider and geometry changes

tests/geometry/box-brush-geometry.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, it } from "vitest";
 
 import { createBoxBrush } from "../../src/document/brushes";
 import { getBoxBrushBounds, getBoxBrushCornerPositions } from "../../src/geometry/box-brush";
+import { buildBoxBrushDerivedMeshData, validateBoxBrushGeometry } from "../../src/geometry/box-brush-mesh";
 
 describe("box brush geometry", () => {
   it("builds finite bounds and eight corner positions from canonical box data", () => {
@@ -67,4 +68,40 @@ describe("box brush geometry", () => {
     expect(corners).toHaveLength(8);
     expect(new Set(corners.map((corner) => `${corner.x}:${corner.y}:${corner.z}`)).size).toBe(8);
   });
+
+  it("triangulates non-planar quad faces deterministically from authored whitebox geometry", () => {
+    const brush = createBoxBrush();
+    brush.geometry.vertices.posX_posY_posZ.z += 0.75;
+    brush.size = {
+      x: 2,
+      y: 2,
+      z: 2.75
+    };
+
+    const diagnostics = validateBoxBrushGeometry(brush);
+    const derivedMesh = buildBoxBrushDerivedMeshData(brush);
+
+    expect(diagnostics).toEqual([]);
+    expect(derivedMesh.faceSurfaces).toHaveLength(6);
+    expect(derivedMesh.faceSurfaces.every((surface) => surface.triangles).flat()).toHaveLength(12);
+    expect(Array.from(derivedMesh.colliderIndices)).toHaveLength(36);
+  });
+
+  it("reports degenerate authored whitebox faces clearly", () => {
+    const brush = createBoxBrush();
+    const collapsedVertex = { x: 1, y: 1, z: 1 };
+    brush.geometry.vertices.negX_posY_posZ = collapsedVertex;
+    brush.geometry.vertices.posX_posY_posZ = collapsedVertex;
+    brush.geometry.vertices.posX_posY_negZ = collapsedVertex;
+    brush.geometry.vertices.negX_posY_negZ = collapsedVertex;
+
+    expect(validateBoxBrushGeometry(brush)).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          code: "degenerate-box-face",
+          faceId: "posY"
+        })
+      ])
+    );
+  });
 });