2 files changed, 9 insertions, 6 deletions
diff --git a/test/unit/index.js b/test/unit/index.js
index 642099db..83a2dcdb 100644
--- a/test/unit/index.js
+++ b/test/unit/index.js
@@ -1,7 +1,3 @@
-// Polyfill fn.bind() for PhantomJS
-/* eslint-disable no-extend-native */
-Function.prototype.bind = require('function-bind')
-
 // require all test files (files that ends with .spec.js)
 const testsContext = require.context('./specs', true, /\.spec$/)
 testsContext.keys().forEach(testsContext)
diff --git a/test/unit/karma.conf.js b/test/unit/karma.conf.js
index 8b4145e2..8465523a 100644
--- a/test/unit/karma.conf.js
+++ b/test/unit/karma.conf.js
@@ -53,11 +53,18 @@ module.exports = function (config) {
     // 1. install corresponding karma launcher
     //    http://karma-runner.github.io/0.13/config/browsers.html
     // 2. add it to the `browsers` array below.
-    browsers: ['PhantomJS'],
+    browsers: ['FirefoxHeadless'],
     frameworks: ['mocha', 'sinon-chai'],
     reporters: ['mocha'],
+    customLaunchers: {
+      'FirefoxHeadless': {
+        base: 'Firefox',
+        flags: [
+          '-headless',
+        ]
+      }
+    },
     files: [
-      '../../node_modules/@babel/polyfill/dist/polyfill.js',
       './index.js'
     ],
     preprocessors: {