Use headless chrome instead of phantomjs for tests

karma.conf.js

@@ -113,8 +113,23 @@ module.exports = function (config) {
         browsers: [
             'Chrome',
             //'PhantomJS',
+            //'ChromeHeadless'
         ],
 
+        customLaunchers: {
+            'ChromeHeadless': {
+                base: 'Chrome',
+                flags: [
+                    // '--no-sandbox',
+                    // See https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md
+                    '--headless',
+                    '--disable-gpu',
+                    // Without a remote debugging port, Google Chrome exits immediately.
+                    '--remote-debugging-port=9222',
+                ],
+            }
+        },
+
         // Continuous Integration mode
         // if true, Karma captures browsers, runs the tests and exits
         // singleRun: false,

package.json

@@ -48,7 +48,7 @@
     "lintall": "eslint src/ test/",
     "clean": "rimraf lib webapp electron_app/dist",
     "prepublish": "npm run build:compile",
-    "test": "karma start --single-run=true --autoWatch=false --browsers PhantomJS --colors=false",
+    "test": "karma start --single-run=true --autoWatch=false --browsers ChromeHeadless --colors=false",
     "test-multi": "karma start"
   },
   "dependencies": {