How can i run Ember test using node-webkit in an docker container

I have created an ember application and i am running that application on node-webkit. In my application i have used node objects also like process object. So when i am trying to run my ember test "ember test --server --module='Unit | Route | application'" it runs the test in chrome which gives error that process is not defined. And when i open http://localhost:7375/ in node-webkit it works fine. So how can i run my ember test case in a headless node-webkit. I mean i have to run my ember test in an docker container, so how can i achieve this by using node-webkit and get the test report.

And is there any way we can provide nw option in testem.js file

module.exports = {
 test_page: 'tests/index.html?hidepassed',
 disable_watching: true,
 launch_in_ci: [
  'Chrome'
 ],
 launch_in_dev: [
    'Chrome'
 ],
 browser_args: {
 Chrome: {
 ci: [
   // --no-sandbox is needed when running Chrome inside a container
   process.env.CI ? '--no-sandbox' : null,
   '--headless',
   '--disable-dev-shm-usage',
   '--disable-software-rasterizer',
   '--mute-audio',
   '--remote-debugging-port=0',
   '--window-size=1440,900'
 ].filter(Boolean)
 }
}   };