mock browser

karma.conf.js

@@ -4,7 +4,7 @@ module.exports = function (config) {
 
   config.set({
     basePath: '',
-    frameworks: ['mocha'],
+    frameworks: ['mocha', 'sinon'],
     files: [
       'test/main.js',
       'test/**/*.test.js',

test/main.js

@@ -1,2 +1,6 @@
 import chai from 'chai';
+const browserFake = require('webextensions-api-fake');
+const browser = browserFake();
+
 global.expect = chai.expect;
+global.browser = browser;