feat: Added headless test configuration

(vscode debug support)

karma.conf.js

@@ -1,7 +1,7 @@
 // Karma configuration file, see link for more information
 // https://karma-runner.github.io/1.0/config/configuration-file.html
 
-module.exports = function (config) {
+module.exports = function(config) {
   config.set({
     basePath: '',
     frameworks: ['jasmine', '@angular-devkit/build-angular'],
@@ -10,22 +10,28 @@ module.exports = function (config) {
       require('karma-chrome-launcher'),
       require('karma-jasmine-html-reporter'),
       require('karma-coverage-istanbul-reporter'),
-      require('@angular-devkit/build-angular/plugins/karma')
+      require('@angular-devkit/build-angular/plugins/karma'),
     ],
     client: {
-      clearContext: false // leave Jasmine Spec Runner output visible in browser
+      clearContext: false, // leave Jasmine Spec Runner output visible in browser
     },
     coverageIstanbulReporter: {
       dir: require('path').join(__dirname, '../coverage'),
       reports: ['html', 'lcovonly'],
-      fixWebpackSourcePaths: true
+      fixWebpackSourcePaths: true,
     },
     reporters: ['progress', 'kjhtml'],
     port: 9876,
     colors: true,
     logLevel: config.LOG_INFO,
     autoWatch: true,
-    browsers: ['Chrome'],
-    singleRun: false
+    browsers: ['Chrome', 'ChromeHeadlessDebug'],
+    customLaunchers: {
+      ChromeHeadlessDebug: {
+        base: 'ChromeHeadless',
+        flags: ['--remote-debugging-port=9333'],
+      },
+    },
+    singleRun: false,
   });
-};
+};