抽取共享 ResizeObserver 测试桩

让项目开发测试复用统一 observer 安装 helper

保留 observer 创建与断开计数断言

apps/ai-game-creator-shell/tests/appSurface/harness.ts

@@ -1227,6 +1227,32 @@ async function openMainProject(projectPath: string) {
   ).not.toBeNull();
 }
 
+export function installResizeObserverStub() {
+  let observerCount = 0;
+  let observerDisconnected = false;
+  class TestResizeObserver {
+    constructor(readonly callback: ResizeObserverCallback) {
+      observerCount += 1;
+    }
+
+    observe() {}
+
+    unobserve() {}
+
+    disconnect() {
+      observerDisconnected = true;
+    }
+  }
+  Object.defineProperty(window, 'ResizeObserver', {
+    configurable: true,
+    value: TestResizeObserver,
+  });
+  return {
+    observerCount: () => observerCount,
+    observerDisconnected: () => observerDisconnected,
+  };
+}
+
 beforeEach(() => {
   resetLlmModelCatalogCacheForTest();
   vi.spyOn(clientApi, 'loadClientLlmModels').mockResolvedValue({

apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts

@@ -34,6 +34,7 @@ import {
   GAME_CREATION_AGENT_RUN_SCHEMA_VERSION,
   type GameCreationAgentRunTrace,
   getResourceSelectButton,
+  installResizeObserverStub,
   it,
   mockRoleAgentReply,
   openResourceFilterPanel,
@@ -4708,25 +4709,7 @@ export function registerProjectWorkbenchFoundationTests() {
         manuallyPlaced: false,
       },
     ];
-    let observerCount = 0;
-    let observerDisconnected = false;
-    class TestResizeObserver {
-      constructor(readonly callback: ResizeObserverCallback) {
-        observerCount += 1;
-      }
-
-      observe() {}
-
-      unobserve() {}
-
-      disconnect() {
-        observerDisconnected = true;
-      }
-    }
-    Object.defineProperty(window, 'ResizeObserver', {
-      configurable: true,
-      value: TestResizeObserver,
-    });
+    const resizeObserver = installResizeObserverStub();
     const animationFrame = vi.spyOn(window, 'requestAnimationFrame');
     const originalGetBoundingClientRect =
       HTMLElement.prototype.getBoundingClientRect;
@@ -4818,7 +4801,7 @@ export function registerProjectWorkbenchFoundationTests() {
         /^url\(#.+-asset-reference-arrow\)$/u,
       );
     });
-    expect(observerCount).toBe(1);
+    expect(resizeObserver.observerCount()).toBe(1);
     expect(
       overlay
         .querySelector('[data-testid="resource-dependency-overlay-scene"]')
@@ -4865,7 +4848,7 @@ export function registerProjectWorkbenchFoundationTests() {
       ),
     );
     rendered.unmount();
-    expect(observerDisconnected).toBe(true);
+    expect(resizeObserver.observerDisconnected()).toBe(true);
     expect(removeViewportListener).toHaveBeenCalledWith(
       'scroll',
       expect.any(Function),
@@ -5917,12 +5900,7 @@ export function registerProjectWorkbenchFoundationTests() {
   });
 
   it('restores resource canvas panning after returning from the UI editor', async () => {
-    class TestResizeObserver {
-      constructor(_callback: ResizeObserverCallback) {}
-      observe() {}
-      disconnect() {}
-    }
-    vi.stubGlobal('ResizeObserver', TestResizeObserver);
+    installResizeObserverStub();
     const manifest = createGameCreationAppManifest(
       'workbench-ui-editor-return-pan',
       'UI 编辑器返回平移测试',