Recreate nightwatch.js chai issue

nightwatch_chai.js

var expect = require('chai').expect;



module.exports = {

  before : function(browser) {
    console.log('Setting up...');
  },

  after : function(browser) {
    console.log('Closing down...');
    browser.end();
  },



  'Demo test Google' : function (browser) {
    console.log('Running Test...');
    browser
      .url('http://www.google.com')
      .waitForElementVisible('body', 1000);

      browser
      .setValue('input[type=text]', 'nightwatch')
      .waitForElementVisible('button[name=btnG]', 1000)
      .click('button[name=btnG]')
      .pause(1000)
      .assert.containsText('#main', 'Night Watch');

      browser.getText('#main', function(result) {
        expect(result.value).to.contain('text');
      });


  }

};