made it single run and headless

karma.conf.js

@@ -7,7 +7,12 @@ module.exports = function (config) {
     // base path that will be used to resolve all patterns (eg. files, exclude)
     basePath: '',
 
-    plugins: ['karma-remap-istanbul', 'karma-coverage', 'karma-mocha', 'karma-phantomjs-launcher', 'karma-chrome-launcher'],
+    plugins: [
+      'karma-remap-istanbul',
+      'karma-coverage',
+      'karma-mocha',
+      'karma-chrome-launcher'
+    ],
 
     // frameworks to use
     // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
@@ -74,14 +79,13 @@ module.exports = function (config) {
     // start these browsers
     // available browser launchers: https://www.npmjs.com/search?q=keywords:karma-launcher
     browsers: [
-      'Chrome',
-      'PhantomJS'
+      'ChromeHeadless'
     ],
 
 
     // Continuous Integration mode
     // if true, Karma captures browsers, runs the tests and exits
-    singleRun: false,
+    singleRun: true,
 
     // Concurrency level
     // how many browser instances should be started simultaneously

package.json

@@ -100,10 +100,9 @@
     "karma-chrome-launcher": "^3.1.0",
     "karma-coverage": "^2.0.3",
     "karma-mocha": "^2.0.1",
-    "karma-phantomjs-launcher": "^1.0.4",
     "karma-remap-istanbul": "^0.6.0",
-    "mapillary-js": "4.0.0",
     "mapillary_sprite_source": "^1.8.0",
+    "mapillary-js": "4.0.0",
     "minimist": "^1.2.3",
     "mocha": "^7.0.1",
     "name-suggestion-index": "~6.0",