Drop support for phantomjs

.travis.yml

@@ -12,8 +12,6 @@ cache:
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH=$HOME/.yarn/bin:$PATH
-  - yarn global add phantomjs-prebuilt
-  - phantomjs --version
 
 install:
   - yarn install --ignore-engines --no-lockfile --non-interactive

testem.js

@@ -3,10 +3,24 @@ module.exports = {
   "test_page": "tests/index.html?hidepassed",
   "disable_watching": true,
   "launch_in_ci": [
-    "PhantomJS"
+    "Chrome"
   ],
   "launch_in_dev": [
-    "PhantomJS",
     "Chrome"
-  ]
+  ],
+  browser_args: {
+    Chrome: {
+      ci: [
+        // --no-sandbox is needed when running Chrome inside a container
+        process.env.CI ? '--no-sandbox' : null,
+        '--headless',
+        '--disable-gpu',
+        '--disable-dev-shm-usage',
+        '--disable-software-rasterizer',
+        '--mute-audio',
+        '--remote-debugging-port=0',
+        '--window-size=1440,900'
+      ].filter(Boolean)
+    }
+  }
 };