run karma on chrome headless

frontend/karma.conf.js

@@ -106,7 +106,13 @@ module.exports = function (config) {
 
     // start these browsers
     // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['Firefox'],
+    browsers: ['HeadlessChrome'],
+    customLaunchers:{
+      HeadlessChrome:{
+        base: 'Chrome',
+        flags: ['--headless', '--disable-gpu', '--remote-debugging-port=9222']
+      }
+    },
 
 
     // Continuous Integration mode

frontend/npm-shrinkwrap.json

@@ -3834,7 +3834,7 @@
     "jquery-mockjax": {
       "version": "2.2.2",
       "resolved": "https://registry.npmjs.org/jquery-mockjax/-/jquery-mockjax-2.2.2.tgz",
-      "integrity": "sha512-stVgUln5bo7g14KjeU45c31nAYlBHAUVBo4JbdoDYIJ3i6Nzlu8mkjKcAviwad9AU1dBEHHpuzA7R6mKcWgvZA==",
+      "integrity": "sha1-nH0rEDpEz2HJnMeKnueHhQS2CQc=",
       "dev": true,
       "requires": {
         "jquery": "3.3.1"

frontend/package.json

@@ -14,7 +14,7 @@
     "karma-chai": "~0.1.0",
     "karma-chai-as-promised": "^0.1.2",
     "karma-chai-sinon": "~0.1.3",
-    "karma-chrome-launcher": "~0.1.3",
+    "karma-chrome-launcher": "^0.1.12",
     "karma-firefox-launcher": "~0.1.3",
     "karma-mocha": "^1.3.0",
     "karma-ng-html2js-preprocessor": "^0.1.2",
@@ -24,8 +24,8 @@
     "sinon": "^1.17.5",
     "sinon-chai": "^2.8.0",
     "sorted-object": "^1.0.0",
-    "webpack-bundle-analyzer": "2.11.1",
     "tslint": "5.9.1",
+    "webpack-bundle-analyzer": "2.11.1",
     "webpack-dev-server": "^1.6.5"
   },
   "dependencies": {