test: add test case for blocksuite editor (#1528)

tests/parallels/debug-init-page.spec.ts

@@ -0,0 +1,17 @@
+import { expect } from '@playwright/test';
+
+import { test } from '../libs/playwright';
+
+test.describe('Debug page broadcast', () => {
+  test('should broadcast a message to all debug pages', async ({ page }) => {
+    await page.goto(
+      'http://localhost:8080/_debug/init-page?type=importMarkdown'
+    );
+    await page.waitForSelector('rich-text');
+    const pageId = await page.evaluate(async () => {
+      // @ts-ignore
+      return globalThis.page.id;
+    });
+    expect(pageId).toBe('page0');
+  });
+});