split test into unit and integration

provide some dummy tests cases

test/integration/render.js

@@ -0,0 +1,13 @@
+const path = require('path')
+
+const {expect} = require('chai')
+
+const {init, expectSameDom} = require('../_helper')
+
+describe('full docsify initialization', function() {
+	it('TODO: check generated markup', async function() {
+		const {docsify, dom} = await init('simple', {loadSidebar: true})
+  		console.log(dom.window.document.body.innerHTML)
+	})
+
+})