diff --git a/tests/serialization/whitebox-primitives-json.test.ts b/tests/serialization/whitebox-primitives-json.test.ts
index f7dbceb4..0fefa746 100644
--- a/tests/serialization/whitebox-primitives-json.test.ts
+++ b/tests/serialization/whitebox-primitives-json.test.ts
@@ -1,7 +1,9 @@
 import { describe, expect, it } from "vitest";
 
 import {
+  createConeBrush,
   createRadialPrismBrush,
+  createTorusBrush,
   createWedgeBrush
 } from "../../src/document/brushes";
 import { createEmptySceneDocument } from "../../src/document/scene-document";
@@ -11,7 +13,7 @@ import {
 } from "../../src/serialization/scene-document-json";
 
 describe("whitebox primitive scene JSON", () => {
-  it("round-trips wedge and cylinder brushes through scene JSON", () => {
+  it("round-trips wedge, cylinder, cone, and torus brushes through scene JSON", () => {
     const document = createEmptySceneDocument({ name: "Primitive Scene" });
     const wedge = createWedgeBrush({
       id: "brush-wedge-json"
@@ -20,9 +22,20 @@ describe("whitebox primitive scene JSON", () => {
       id: "brush-cylinder-json",
       sideCount: 12
     });
+    const cone = createConeBrush({
+      id: "brush-cone-json",
+      sideCount: 12
+    });
+    const torus = createTorusBrush({
+      id: "brush-torus-json",
+      majorSegmentCount: 16,
+      tubeSegmentCount: 8
+    });
 
     document.brushes[wedge.id] = wedge;
     document.brushes[cylinder.id] = cylinder;
+    document.brushes[cone.id] = cone;
+    document.brushes[torus.id] = torus;
 
     expect(parseSceneDocumentJson(serializeSceneDocument(document))).toEqual(
       document