test with headless chrome

.travis.yml

@@ -6,6 +6,10 @@ node_js:
   - "4"
 
 sudo: false
+dist: trusty
+
+addons:
+  chrome: stable
 
 cache:
   yarn: true
@@ -15,9 +19,7 @@ cache:
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH=$HOME/.yarn/bin:$PATH
-  - yarn global add bower phantomjs-prebuilt
   - bower --version
-  - phantomjs --version
 
 install:
   - yarn install --no-lockfile

testem.js

@@ -1,12 +1,23 @@
 /* eslint-env node */
 module.exports = {
-  'test_page': 'tests/index.html?hidepassed',
-  'disable_watching': true,
-  'launch_in_ci': [
-    'PhantomJS'
+  framework: 'mocha',
+  test_page: 'tests/index.html?hidepassed',
+  disable_watching: true,
+  launch_in_ci: [
+    'Chrome'
   ],
-  'launch_in_dev': [
-    'PhantomJS',
+  launch_in_dev: [
     'Chrome'
-  ]
+  ],
+  browser_args: {
+    Chrome: {
+      mode: 'ci',
+      args: [
+        '--disable-gpu',
+        '--headless',
+        '--remote-debugging-port=9222',
+        '--window-size=1440,900'
+      ]
+    },
+  }
 };