check if env vars are set

test/test.js

@@ -23,7 +23,10 @@ describe('Application life cycle test', function () {
     this.timeout(0);
     var server, browser = new require('selenium-webdriver/firefox').Driver();
 
-    before(function () {
+    before(function (done) {
+        if (!process.env.USERNAME) return done(new Error('USERNAME env var not set'));
+        if (!process.env.PASSWORD) return done(new Error('PASSWORD env var not set'));
+
         var seleniumJar= require('selenium-server-standalone-jar');
         var SeleniumServer = require('selenium-webdriver/remote').SeleniumServer;
         server = new SeleniumServer(seleniumJar.path, { port: 4444 });