test($shared-utils): cover more cases for unescapeHtml

Author: billyyyyy3320

packages/@vuepress/shared-utils/__tests__/unescapeHtml.spec.ts

@@ -1,7 +1,7 @@
 import unescapeHtml from '../src/unescapeHtml'
 
 test('should unescape html', () => {
-  const input = '<div>'
-  expect(unescapeHtml(input)).toBe('<div>')
+  const input = `&lt;div :id=&quot;&#39;app&#39;&quot;&gt;`
+  expect(unescapeHtml(input)).toBe(`<div :id="'app'">`)
 })