Fix unit test error

tests/unit/page.js

@@ -369,7 +369,7 @@ describe('Page class', () => {
 
   describe('platform specific content', () => {
     test('page.defaultPlatform frontmatter', async () => {
-      const page = new Page({
+      const page = await Page.init({
         relativePath: 'actions/hosting-your-own-runners/configuring-the-self-hosted-runner-application-as-a-service.md',
         basePath: path.join(__dirname, '../../content'),
         languageCode: 'en'