add an intial test file for testing SSR

Author: trusktr

packages/docsify-server-renderer/index.js

@@ -197,4 +197,6 @@ export default class Renderer {
   }
 }
 
+export { Renderer };
+
 Renderer.version = '__VERSION__';

test/_helper.js

@@ -22,7 +22,7 @@ function ready(callback) {
 module.exports.initJSDOM = initJSDOM;
 
 /** @param {string} markup - The HTML document to initialize JSDOM with. */
-function initJSDOM(markup, options = {}) {
+function initJSDOM(markup = '', options = {}) {
   const dom = new JSDOM(markup, options);
 
   global.window = dom.window;

test/unit/server.test.js

@@ -0,0 +1,18 @@
+// @ts-check
+/* eslint-disable no-global-assign */
+require = require('esm')(
+  module /* , options */
+); /* eslint-disable-line no-global-assign */
+const { expect } = require('chai');
+const { initJSDOM } = require('../_helper');
+
+initJSDOM();
+
+const { Renderer } = require('../../packages/docsify-server-renderer/index');
+
+describe('pacakges/docsify-server-render', function() {
+  it('toURL', function() {
+    expect(Renderer).to.be.an.instanceof(Function);
+    expect('foo').equal('foo');
+  });
+});