fix lint and add puppeter

Author: Irfan Maulana

src/RangedatePicker.vue

@@ -194,6 +194,12 @@
   line-height: 2em;
 }
 
+.calendar_preset li {
+  line-height: 2.6em;
+  width: auto;
+  display: block;
+}
+
 .calendar_days li:hover {
   background: #eee;
   color: #000;
@@ -213,12 +219,6 @@ li.calendar_days_in-range {
   padding: 0;
 }
 
-.calendar_preset li {
-  line-height: 2.6em;
-  width: auto;
-  display: block;
-}
-
 .calendar_preset li.calendar_preset-ranges {
   padding: 0 30px 0 10px;
   margin-bottom: 5px;

test/karma.conf.js

@@ -16,13 +16,15 @@ vueRule.options.loaders.js = 'babel-loader'
 // no need for app entry during tests
 delete webpackConfig.entry
 
+process.env.CHROME_BIN = require('puppeteer').executablePath()
+
 module.exports = function (config) {
   config.set({
     // to run in additional browsers:
     // 1. install corresponding karma launcher
     //    http://karma-runner.github.io/0.13/config/browsers.html
     // 2. add it to the `browsers` array below.
-    browsers: ['Chrome'],
+    browsers: ['ChromeHeadless', 'Chrome'],
     frameworks: ['mocha', 'chai-dom', 'sinon-chai'],
     reporters: ['spec', 'coverage'],
     files: ['./index.js'],