testem: Use headless Chrome to run tests

.travis.yml

@@ -4,6 +4,10 @@ node_js:
   - "4"
 
 sudo: false
+dist: trusty
+
+addons:
+  chrome: stable
 
 cache:
   yarn: true
@@ -21,15 +25,13 @@ env:
 matrix:
   fast_finish: true
   allow_failures:
-    - env: EMBER_TRY_SCENARIO=ember-beta
     - env: EMBER_TRY_SCENARIO=ember-canary
 
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH=$HOME/.yarn/bin:$PATH
-  - yarn global add bower phantomjs-prebuilt
+  - yarn global add bower
   - bower --version
-  - phantomjs --version
 
 install:
   - yarn install --no-lockfile

package.json

@@ -53,6 +53,7 @@
     "ember-cli-htmlbars-inline-precompile": "^1.0.0",
     "ember-cli-inject-live-reload": "^1.4.1",
     "ember-cli-shims": "^1.1.0",
+    "ember-disable-prototype-extensions": "^1.1.2",
     "ember-load-initializers": "^1.0.0",
     "ember-resolver": "^4.0.0",
     "ember-source": "~2.17.0",

testem.js

@@ -6,10 +6,23 @@ module.exports = {
   "test_page": "tests/index.html?hidepassed",
   "disable_watching": true,
   "launch_in_ci": [
-    "PhantomJS"
+    "Chrome",
   ],
   "launch_in_dev": [
-    "PhantomJS",
-    "Chrome"
-  ]
+    "Chrome",
+  ],
+  "browser_args": {
+    "Chrome": {
+      mode: 'ci',
+      args: [
+        // --no-sandbox is needed when running Chrome inside a container
+        process.env.TRAVIS ? '--no-sandbox' : null,
+
+        '--disable-gpu',
+        '--headless',
+        '--remote-debugging-port=0',
+        '--window-size=1440,900',
+      ].filter(Boolean),
+    },
+  },
 };

yarn.lock

@@ -2003,6 +2003,10 @@ ember-cli@~2.16.0:
     walk-sync "^0.3.0"
     yam "0.0.22"
 
+ember-disable-prototype-extensions@^1.1.2:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/ember-disable-prototype-extensions/-/ember-disable-prototype-extensions-1.1.3.tgz#1969135217654b5e278f9fe2d9d4e49b5720329e"
+
 ember-load-initializers@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/ember-load-initializers/-/ember-load-initializers-1.0.0.tgz#4919eaf06f6dfeca7e134633d8c05a6c9921e6e7"