webdriverjs-error-catching.js

/*global console */

/*
* In this file, we do a search for two non-existent selectors
* However the failure of only one of them contains the error we actually want
*/

(function() {

	"use strict";

	var webdriver = require('selenium-webdriver');
	var driver = new webdriver.Builder().usingServer().withCapabilities({'browserName': 'chrome' }).build();

	webdriver.promise.controlFlow().on('uncaughtException', function(e) {
		/*
		* Much better logging here, starts with: "NoSuchElementError: no such element"
		* <stack trace>
		* ==== async task ====
		* WebDriver.findElement(By.cssSelector(".non-existent2"))
		* ^ bingo
		*/
		console.error('\n' + e.stack);
	});

	function handleError(err) {
		//NoSuchElementError: no such element - there is no selector information however
		console.log('\nError with findElement', err.stack);
	}

	driver.manage().window().setSize(1280, 720).then(function() {
		driver.get('http://www.google.com');
		driver.findElement(webdriver.By.css('.non-existent1')).then(null, handleError);

		// Notice how 'uncaughtException' is triggered resulting in much improved logging
		driver.findElement(webdriver.By.css('.non-existent2')).then(null);
		driver.quit();
	});

}());