ci: tests not running in travis

Author: edoparearyee

.travis.yml

@@ -1,20 +1,26 @@
 dist: trusty
 sudo: false
+
 language: node_js
 node_js:
   - "8"
-os:
-  - linux
-before_install:
-  # Use a virtual display.
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
-  # Install latest chrome.
-  - export CHROME_BIN=chromium-browser
+
+addons:
+  apt:
+    sources:
+      - google-chrome
+    packages:
+      - google-chrome-stable
+
+cache:
+  directories:
+     - ./node_modules
+
 install:
-  - npm install --no-progress
+  - npm install
+
 script:
-  - npm run lint
-  - npm run test -- --no-progress --code-coverage --single-run --browser=ChromeNoSandbox
-  - npm run e2e -- --no-progress
-  - npm run coverage
+  # Use Chromium instead of Chrome.
+  - export CHROME_BIN=chromium-browser
+  - xvfb-run -a npm run test -- --no-progress --single-run --code-coverage --browser=ChromeNoSandbox
+  - xvfb-run -a npm run e2e -- --no-progress