diff --git a/blocksuite/affine/gfx/turbo-renderer/src/turbo-renderer.ts b/blocksuite/affine/gfx/turbo-renderer/src/turbo-renderer.ts
index b92c405d79..e6333c18a1 100644
--- a/blocksuite/affine/gfx/turbo-renderer/src/turbo-renderer.ts
+++ b/blocksuite/affine/gfx/turbo-renderer/src/turbo-renderer.ts
@@ -73,11 +73,11 @@ export const TurboRendererConfigFactory =
 export class ViewportTurboRendererExtension extends GfxExtension {
   static override key = 'viewportTurboRenderer';
 
-  private readonly state$ = new BehaviorSubject<RenderingState>('inactive');
+  public readonly state$ = new BehaviorSubject<RenderingState>('inactive');
   public readonly canvas: HTMLCanvasElement = document.createElement('canvas');
+  public layoutCacheData: ViewportLayoutTree | null = null;
   private readonly worker: Worker;
   private readonly disposables = new DisposableGroup();
-  private layoutCacheData: ViewportLayoutTree | null = null;
   private layoutVersion = 0;
   private bitmap: ImageBitmap | null = null;
   private viewportElement: GfxViewportElement | null = null;
diff --git a/blocksuite/integration-test/src/__tests__/edgeless/viewport-renderer.spec.ts b/blocksuite/integration-test/src/__tests__/edgeless/turbo-renderer.spec.ts
similarity index 50%
rename from blocksuite/integration-test/src/__tests__/edgeless/viewport-renderer.spec.ts
rename to blocksuite/integration-test/src/__tests__/edgeless/turbo-renderer.spec.ts
index b567fbd183..3ac3b4f58e 100644
--- a/blocksuite/integration-test/src/__tests__/edgeless/viewport-renderer.spec.ts
+++ b/blocksuite/integration-test/src/__tests__/edgeless/turbo-renderer.spec.ts
@@ -2,6 +2,7 @@
  * Please refer to integration-test/README.md for commands to run tests.
  */
 import { ParagraphLayoutHandlerExtension } from '@blocksuite/affine/blocks/paragraph';
+import { noop } from '@blocksuite/affine/global/utils';
 import {
   TurboRendererConfigFactory,
   ViewportTurboRendererExtension,
@@ -38,31 +39,71 @@ describe('viewport turbo renderer', () => {
 
   test('should access turbo renderer instance', async () => {
     const renderer = getRenderer();
+    expect(renderer).toBeDefined();
     expect(renderer instanceof ViewportTurboRendererExtension).toBe(true);
     expect(renderer.canvas).toBeInstanceOf(HTMLCanvasElement);
   });
 
   test('initial state should be pending', async () => {
     const renderer = getRenderer();
-    expect(renderer.currentState).toBe('pending');
+    expect(renderer.state$.value).toBe('pending');
   });
 
   test('zooming should change state to zooming', async () => {
     const renderer = getRenderer();
     renderer.viewport.zooming$.next(true);
     await wait();
-    expect(renderer.currentState).toBe('zooming');
+    expect(renderer.state$.value).toBe('zooming');
     renderer.viewport.zooming$.next(false);
     await wait();
-    expect(renderer.currentState).not.toBe('zooming');
+    expect(renderer.state$.value).not.toBe('zooming');
   });
 
-  test('state should become ready after rendering', async () => {
+  test('state transitions between pending and ready', async () => {
+    const renderer = getRenderer();
+
+    // Initial state should be pending after adding content
+    addSampleNotes(doc, 1);
+    await wait(100); // Short wait for initial processing
+    expect(renderer.state$.value).toBe('pending');
+
+    // Ensure zooming is off and wait for debounce + buffer
+    renderer.viewport.zooming$.next(false);
+    await wait(renderer.options.debounceTime + 500);
+    expect(renderer.state$.value).toBe('ready');
+  });
+
+  test('initial layout cache data should be null', () => {
+    const renderer = getRenderer();
+    expect(renderer.layoutCacheData).toBeNull();
+  });
+
+  test('invalidation should reset layout cache data to null', async () => {
+    const renderer = getRenderer();
     addSampleNotes(doc, 1);
     await wait(100);
+
+    // Access getter to populate cache
+    const _cache = renderer.layoutCache;
+    noop(_cache);
+    expect(renderer.layoutCacheData).not.toBeNull();
+
+    // Invalidate
+    addSampleNotes(doc, 1);
+    await wait(100);
+
+    expect(renderer.layoutCacheData).toBeNull();
+  });
+
+  test('accessing layoutCache getter should populate cache data', async () => {
     const renderer = getRenderer();
-    renderer.viewport.zooming$.next(false);
-    await wait(renderer.options.debounceTime + 1000);
-    expect(renderer.currentState).toBe('ready');
+    addSampleNotes(doc, 1);
+    await wait();
+    expect(renderer.layoutCacheData).toBeNull(); // Check internal state before access
+
+    const _cache = renderer.layoutCache; // Access getter to populate cache
+    noop(_cache);
+    expect(renderer.layoutCacheData).not.toBeNull(); // Check internal state after access
+    expect(renderer.layoutCache?.roots.length).toBeGreaterThan(0); // Check public getter result
   });
 });