update karma configuration

Author: tiagoschenkel

karma.conf.js

@@ -1,13 +1,11 @@
 process.env.TEST = true;
-process.env.NODE_ENV = 'test';
+process.env.NODE_ENV = "test";
 
-const webpack = require("webpack");
-const path = require("path");
-const webpackConfig = require('./webpack.config.js')({ production: false, karma: true });
+const webpackConfig = require("./webpack.config.js")({ production: false, karma: true });
 
 delete webpackConfig.entry;
 
-module.exports = function(config) {
+module.exports = config => {
 
   var configuration = {
     basePath: "",
@@ -20,7 +18,7 @@ module.exports = function(config) {
     files: [
       "./test/**/**/**.test.ts",
       {
-        pattern: '**/*.map',
+        pattern: "**/*.map",
         served: true,
         included: false,
         watched: true
@@ -65,14 +63,14 @@ module.exports = function(config) {
     colors: true,
     logLevel: config.LOG_INFO,
     autoWatch: true,
-    browsers: ['Chrome']
+    browsers: []
   };
 
   if (process.env.TRAVIS) {
-    configuration.browsers = ['PhantomJS'];
+    configuration.browsers.push("PhantomJS");
     configuration.plugins.push("karma-phantomjs-launcher");
   } else {
-    configuration.browsers = ['PhantomJS'];
+    configuration.browsers.push("PhantomJS");
     configuration.plugins.push("karma-phantomjs-launcher");
   }