Update the template app to reach 100% coverage

And demo jsdom

lib/templates/app/package.json

@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "gh-pages": "^0.11.0",
-    "tarec-plugin-mocha-test": "^1.1.0",
-    "tarec-plugin-sass": "geowarin/tarec-plugin-sass"
+    "tarec-plugin-mocha-test": "^1.2.0",
+    "tarec-plugin-sass": "geowarin/tarec-plugin-sass#master"
   }
 }

lib/templates/app/src/index.js

@@ -2,6 +2,6 @@ import React from 'react';
 import {render} from 'react-dom';
 import App from 'compo/App';
 
-import 'main.scss';
+import './main.scss';
 
 render(<App />, document.getElementById('app'));

lib/templates/app/test/indexTest.js

@@ -0,0 +1,27 @@
+import expect from 'expect';
+import React from 'react';
+import describeWithDom from 'describe-with-dom';
+import App from 'compo/App';
+
+describeWithDom('index', () => {
+
+    it('should render the page', () => {
+        createAppDiv();
+        require('../src/index');
+        expect(getHtmlBody()).toContain('Hello');
+    });
+});
+
+function createAppDiv() {
+  const appDiv = getDocument().createElement('div');
+  appDiv.setAttribute('id', 'app');
+  getDocument().body.appendChild(appDiv);
+}
+
+function getDocument() {
+  return document.defaultView.document;
+}
+
+function getHtmlBody() {
+  return getDocument().documentElement.outerHTML;
+}