Added headless Chrome to the CI test suite

Author: JamesMessinger

.travis.yml

@@ -1,8 +1,10 @@
 # Travis CI config
 # http://docs.travis-ci.com/user/languages/javascript-with-nodejs/
+# https://docs.travis-ci.com/user/customizing-the-build/
+# https://docs.travis-ci.com/user/migrating-from-legacy/
 
 dist: trusty
-sudo: required  # TEMPORARY HACK (see https://github.com/travis-ci/travis-ci/issues/8836)
+sudo: required  # Required for headless Chrome
 language: node_js
 
 addons:
@@ -11,17 +13,16 @@ addons:
 
 matrix:
   include:
-    # Local Browsers
+    # Node 10 + Browser tests
     - node_js: 10
       env: KARMA=true
 
-    # Sauce Labs
-    - node_js: 10
+    # Node 8 + SauceLabs tests
+    - node_js: 8
       env: KARMA=true SAUCE=true
 
-    # Node
+    # Node 6 tests
     - node_js: 6
-    - node_js: 8
 
 before_script:
   # Setup a virtual display for browser testing

karma.conf.js

@@ -95,7 +95,7 @@ function configureLocalBrowsers (config) {
     config.browsers = ['Firefox', 'Chrome', 'Safari'];
   }
   else if (isLinux) {
-    config.browsers = ['Firefox'];
+    config.browsers = ['Firefox', 'ChromeHeadless'];
   }
   else if (isWindows) {
     config.browsers = ['Firefox', 'Chrome', 'IE', 'Edge'];
@@ -158,6 +158,7 @@ function configureSauceLabs (config) {
   config.browsers = Object.keys(config.customLaunchers);
   config.concurrency = 1;
   config.captureTimeout = 60000;
+  config.browserDisconnectTolerance = 5,
   config.browserDisconnectTimeout = 60000;
   config.browserNoActivityTimeout = 60000;
   // config.logLevel = 'debug';