chore: switch from phantomjs to chrome headless

Author: joelmukuthu

.travis.yml

@@ -1 +1,3 @@
 language: node_js
+addons:
+  chrome: stable

package.json

@@ -25,14 +25,14 @@
     "grunt-contrib-uglify": "^4.0.0",
     "grunt-release-it": "^1.0.1",
     "karma": "^4.0.1",
+    "karma-chrome-launcher": "^2.2.0",
     "karma-coverage": "^1.0.0",
     "karma-coveralls": "^2.0.0",
     "karma-mocha": "^1.0.1",
     "karma-mocha-reporter": "^2.0.5",
-    "karma-phantomjs-launcher": "^1.0.0",
     "load-grunt-tasks": "^4.0.0",
     "mocha": "^6.0.0",
-    "phantomjs-prebuilt": "^2.1.8",
+    "puppeteer": "^1.14.0",
     "sinon": "^7.2.4",
     "unexpected": "^11.0.1",
     "unexpected-sinon": "^10.11.1"

test/karma.conf.js

@@ -10,14 +10,16 @@ if (process.env.TRAVIS) {
     reporters.push('coveralls');
 }
 
+process.env.CHROME_BIN = require('puppeteer').executablePath();
+
 module.exports = function (config) {
     config.set({
-        browsers: [ 'PhantomJS' ],
+        browsers: [ 'ChromeHeadless' ],
         plugins: [
             'karma-mocha',
             'karma-coverage',
             'karma-coveralls',
-            'karma-phantomjs-launcher',
+            'karma-chrome-launcher',
             'karma-mocha-reporter'
         ],
         frameworks: [ 'mocha' ],