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An introduction to automated testing using JavaScript, focusing on QUnit, Jasmine, Protractor, Selenium, PhantomJS, and GhostDriver.
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Why bother with tests?
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Confidence in your application
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If I change something, I’m confident that I didn’t break the application
If I install something, I’m confident that it didn’t break the application
At any point, I’m confident that the application still works as expected
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Types of tests
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Unit Test – test discreet methods, functions, or services
E2E Test – test end to end operation of the application
Compatibility Test – test with different browsers/devices/environments
Performance Test – test with various loads and stress
Security Test – test the confidentiality and integrity of the application
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Tools for testing
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“Undercurrent” of JavaScript tools for testing
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Why JavaScript for testing?
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No cost to download
Open source frameworks can be forked/modified
Very modular – combination of frameworks and runners
Vibrant and active development
If I’m writing my client and server in JavaScript, why not my tests?
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http://qunitjs.com JavaScript unit testing framework
Used to test jQuery, jQuery UI and jQuery Mobile
test("a basic test example", function() {
ok( true, "this test is fine" );
var value = "hello";
equal( value, "hello", "We expect value to be hello" );
});
Demo
Testing what the user actually “sees”
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http://seleniumhq.org Web Application testing platform
Open source (Apache 2.0), released by TW in 2004
Selenium IDE – basic recorder, implemented as a Firefox Extension
Selenium WebDriver – “remote control” for browser
Selenium Grid – instantiate browsers on remote machines
Demo - IDE
Shortcomings of Selenium IDE
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No test inheritance
Output is HTML, not script
Difficult to inject any complex logic
Has to be manually run through Firefox
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Browser
Selenium Host
WebDriver
Application to test
Tests
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http://pivotal.github.io/jasmine/ BDD Framework for writing JavaScript tests
Clean syntax
Support for mocks (spies)
describe("a basic test example", function() {
it(“tests that true is always the truth”, function() {
expect(true).toBe(true);
});
});
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https://github.com/angular/protractor Testing framework for AngularJS, built on top of WebDriverJS
Supports Jasmine tests by default(Mocha coming soon)
Scripts to support easy install of Selenium
Protractor
npm install –g protractor
webdriver-manager update
webdriver-manager start
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Browser (Chrome)
Selenium Host
WebDriverJS
Application to test
Tests (Jasmine)
Protractor
Demo
Can I do unit testing using Selenium also?
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Browser (Chrome)
Selenium Host
WebDriverJS
QUnit Web Page
Tests (Jasmine)
Protractor
Demo
Do I have to launch a browser?
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http://phantomjs.org Headless (Qt)WebKit with JavaScript API
Ability to act as a browser without actually having a GUI
Ideal for running in hosted instances (e.g. docker)
page.open(‘http://localhost:8088’, function(status) {
page.evaluate(function() {
/* test elements on the page */
});
});
Demo - Phantom
Nice, but yet another framework?
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Browser (PhantomJS)
Selenium Host
WebDriverJS
Application to test
Tests (Jasmine)
Protractor
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GhostDriver (PhantomJS)
Application to test
Tests (Jasmine)
Protractor
Demo
Conclusion
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Testing is really important to maintain confidence in your application
Abundance of JavaScript testing frameworks, many of which are modular
Unit and end-to-end tests in both browser-based and headless mode
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Q&ASample Code: http://github.com/neudesic/engineering-excellence
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Simon [email protected]
Distinguished EngineerNeudesic, LLC
