Drop PhantomJS for testing

Author: mixonic

testem.js

@@ -1,19 +1,25 @@
-/*jshint node:true*/
-module.exports = {
-  "framework": "qunit",
-  "test_page": "tests/index.html?hidepassed",
-  "disable_watching": true,
-  "launch_in_ci": [
-    "Chrome"
+let options = {
+  test_page: 'tests/index.html?hidepassed',
+  disable_watching: true,
+  launch_in_ci: [
+    'Chrome'
   ],
-  "launch_in_dev": [
-    "PhantomJS",
-    "Chrome"
-  ],
-  "browser_args": {
-    "Chrome": [
-        "--disable-gpu",
-        "--no-sandbox"
-    ]
-  }  
+  launch_in_dev: [
+    'Chrome'
+  ]
 };
+
+if (process.env.TRAVIS) {
+  options.browser_args = {
+    Chrome: [
+      // --no-sandbox is needed when running Chrome inside a container
+      '--no-sandbox',
+      '--disable-gpu',
+      '--headless',
+      '--remote-debugging-port=0',
+      '--window-size=1440,900'
+    ].filter(Boolean)
+  };
+}
+
+module.exports = options;