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Selenium: Less Testing, More Coding

Selenium: Less Testing, More Coding

A comprehensive introduction to Selenium and its place in the automated testing stack. Not really *less* testing, but less *painful* testing. Also, a guide to Sauce Labs.


Jonathan Lipps

October 16, 2012

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  1. SELENIUM Less Testing, More Coding Jonathan Lipps (@jlipps) SDEC ::

    October 16, 2012
  2. Introduction Who am I? Real subtitle: “Better testing with the

    fun of coding” Contributions of Sauce Labs colleagues @admc, @santiycr Assumptions and goals of this talk
  3. Talk Outline Automated testing discussion Selenium & its place in

    the testing stack How Selenium works & demo Selenium gotchas & best practices Sauce Labs & demo Q & A
  4. We all believe in automation, right? QA is necessary, but

    manual QA sucks Risk of unintended consequences grows with app complexity Cheap to run automated tests on every commit Writing automated tests is writing code Opens up possibility of Development Cycle of Optimal Happiness
  5. The Development Cycle of Optimal Happiness

  6. Automated Testing Landscape Unit tests Tests of specific methods/modules Integration

    points are mocked for speed/simplicity Integration / end-to-end / functional tests Tests of entire systems or integration points System is a functional black box from test’s perspective
  7. None
  8. None
  9. The Challenge of Many Platforms Integration tests are better the

    closer they are to reality “Reality” in web environments is hard to simulate People clicking mouse buttons in browsers Different OSes, different browsers, different devices Takeaway: integration tests are more expensive
  10. The Testing Stack of Optimal Happiness

  11. The Place of Selenium Integration tests are a big hammer

    Get as much mileage as you can out of lighter-weight solutions first Debugging Selenium tests is more painful than debugging unit tests Nothing beats Selenium for uncovering cross-platform issues and legitimate stability concerns
  12. How Selenium Works Client/server architecture Scripts speak Selenium API to

    the Selenium Server Selenium Server sends commands to browser Drivers, returns responses to script Independent Drivers for each browser/OS Bindings for speaking Selenium API to the server available in any programming language
  13. How Selenium Works Language bindings Python Nose, unittest, selenium.driver C#

    NUnit, OpenQA.Selenium Ruby RSpec, Cucumber, selenium-webdriver gem Node.js Wd, Mocha, Vows PHP PHPUnit, Sausage, PHPWebDriver Java JUnit, TestNG, org.openqa.selenium.WebDriver
  14. How Selenium Works

  15. A Tale of Two Versions Selenium 1 (Selenium Remote Control)

    Selenium 2 (WebDriver) ^--- use this one
  16. Selenium Demo

  17. Selenium Best Practices Use spinAsserts Avoid brittle locators Run tests

    in parallel to the max Use state generators to save time
  18. spinAsserts Selenium checks page state when you ask it This

    might be before an action’s result has changed the page state, e.g. for AJAX requests Selenium will return information which results in a test failure, but wouldn’t have if it had waited longer Solution: “spin” for responses
  19. spinAsserts

  20. spinAsserts

  21. Avoid brittle locators Many different “locator strategies” in Selenium CSS,

    XPath, ID, link text, tag name, input name Don’t use locators which are likely to break during refactoring of your HTML Use sensible semantics for IDs and classes
  22. Parallelism You don’t want to run Selenium tests serially Challenges

    of parallelism Tests need to be logically independent Tests can’t assume any state Beware of DoS-ing your test server Infrastructure / sysadmin costs
  23. Parallelism: Bad

  24. Parallelism: Good

  25. State Generators

  26. Parallelism to the max! Selenium Grid Open source Your machines,

    your VMs, your browsers, your Selenium Sauce Labs http://saucelabs.com
  27. Sauce Labs PaaS analog of Selenium Grid All OSes and

    browsers that Selenium supports Infrastructure advantages No need to set up or maintain OSes, browsers, or Selenium No need to worry about scaling according to your growth Mobile is hard! Security advantages
  28. Sauce Labs

  29. Sauce Connect

  30. Sauce Labs Feature advantages Videos of every test Automatic screenshots

    taken throughout test Log of Selenium commands and responses Breakpoints: jump into the browser when something goes wrong Team account management REST API etc...
  31. Sauce Labs Demo

  32. Sauce Labs Also check out: SeBuilder http://sebuilder.com Sauce for Mac

  33. Recap Selenium: tool for scripting browsers to act like humans

    Great for integration testing (which should be used judiciously as a part of every build) Be aware of common pitfalls and use Selenium best practices Sauce Labs: pain-free Selenium in the cloud Coding is better and funner than manual QA!
  34. PS: If you haven’t automated yet It’s OK. Don’t be

    embarrassed. We’ve all been there. There’s still time... Do it now! Start small, demand value as you build test coverage. Focus on the money path. Never let bugs prevent someone from giving you $$. Be careful: it’s addictive!
  35. Questions?

  36. Thank you! If you like the Twitters: @jlipps Demo code:

    github.com/jlipps/sauce-php-demo PHP Library: github.com/jlipps/sausage