Replace phantomjs with chrome headless

Author: MuhammadJaziraly

karma.conf.js

@@ -35,6 +35,18 @@ module.exports = function ( config ) {
 		port: 9876,
 
 		logLevel: config.LOG_INFO,
-		browsers: [ 'PhantomJS' ]
+		browsers: [ 'ChromeHeadless' ],
+		customLaunchers: {
+			ChromeHeadless: {
+				base: 'Chrome',
+				flags: [
+					'--no-sandbox',
+					'--headless',
+					'--disable-gpu',
+					'--disable-dev-shm-usage',
+					'--disable-software-rasterizer'
+				]
+			}
+		}
 	} );
 };

package.json

@@ -38,7 +38,7 @@
     "eslint-plugin-mediawiki": "^0.2.1",
     "karma": "^1.7.1",
     "karma-cli": "^1.0.1",
-    "karma-phantomjs-launcher": "^1.0.4",
+    "karma-chrome-launcher": "^3.1.0",
     "karma-qunit": "^1.2.1",
     "karma-webpack": "^4.0.2",
     "qunit": "^1.0.0",