selenium browser stack

var webdriver = require('browserstack-webdriver');

var browserNameList : ['firefox', 'chrome', 'opera'];

for(i = 0; i < browserList; i++) {

	// Input capabilities
	var capabilities = {
	  'browserName' : browserNameList[i], 
	  'browserstack.user' : 'xxx',
	  'browserstack.key' : 'xxx'
	}
	
	var driver = new webdriver.Builder().
	  usingServer('http://hub.browserstack.com/wd/hub').
	  withCapabilities(capabilities).
	  build();
	
	driver.get('http://www.google.com/ncr');
	driver.findElement(webdriver.By.name('q')).sendKeys('BrowserStack');
	driver.findElement(webdriver.By.name('btnG')).click();
	
	test('this is my test condition', function() {
		driver.getTitle().then(function(title) {
		  title.should.equal(myExpectition);
		});
	});
	
	
	driver.quit();

}