Automated Testing using JavaScript
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Automated testing of web applications using JavaScript can provide confidence that changes and new installations do not break existing functionality. There are various types of tests, including unit, end-to-end, compatibility, and performance tests. Popular JavaScript testing tools include QUnit for unit testing, Selenium and Protractor for end-to-end testing, and PhantomJS for headless browser testing without a GUI. These tools can test JavaScript applications and allow writing tests in JavaScript when the application itself is also written in JavaScript.
Automated Testing using JavaScript
- 1. Automated Web Testing using JavaScript Simon Guest [email protected] Distinguished Engineer Neudesic, LLC
- 2. Why bother with tests? 2
- 3. Confidence in your application 3
- 4. 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 4
- 6. 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 6
- 8. 8
- 9. “Undercurrent” of JavaScript tools for testing 9
- 10. Why JavaScript for testing? 10
- 11. 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? 11
- 12. 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 12
- 13. Testing what the user actually “sees” Demo 13
- 14. 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 14
- 15. Shortcomings of Selenium IDE 15
- 16. No test inheritance Output is HTML, not script Difficult to inject any complex logic Has to be manually run through Firefox 16
- 18. 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); }); }); 18
- 19. Protractor 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 npm install –g protractor webdriver-manager update webdriver-manager start 19
- 20. Tests (Jasmine) Protractor WebDriverJS Selenium Host Browser (Chrome) Application to test Demo 20
- 21. Can I do unit testing using Selenium also? 21
- 22. Tests (Jasmine) Protractor WebDriverJS Selenium Host Browser (Chrome) QUnit Web Page Demo 22
- 23. Do I have to launch a browser? 23
- 24. 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 24
- 25. Nice, but yet another framework? 25
- 26. Tests (Jasmine) Protractor WebDriverJS Selenium Host Browser (PhantomJS) Application to test 26
- 27. Tests (Jasmine) Protractor GhostDriver (PhantomJS) Application to test Demo 27
- 28. Conclusion 28
- 29. 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 29
- 30. Q&A Sample Code: http://github.com/neudesic/engineering-excellence Simon Guest [email protected] Distinguished Engineer Neudesic, LLC30