Writing Maintainable Tests with PageObjects
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The document discusses the importance of writing maintainable and expressive tests using page objects in TDD (Test Driven Development) to improve developer skills and test quality. Page objects abstract HTML implementations, allowing acceptance tests to focus on application behaviors, reducing brittleness in tests. It provides practical examples and references for implementing these concepts effectively.
Writing Maintainable Tests with PageObjects
- 1. Writing Maintainable, Expressive Tests with PageObjects Michael Denomy @mdenomy
- 2. About Me • Senior Developer @TerribleLabs • Practicing Agile for ~10 years • @mdenomy on Twitter and gmail • http://mdenomy.wordpress.com/
- 3. I ❤️ TDD
- 4. I ❤️ TDD • Why?
- 5. I ❤️ TDD • Why? • Makes me a better developer
- 6. I ❤️ TDD • Why? • Makes me a better developer • Keeps me thinking of behavior before implementation
- 7. I ❤️ TDD • Why? • Makes me a better developer • Keeps me thinking of behavior before implementation • TDD, BDD, more or less the same for me
- 8. I ❤️ TDD • Why? • Makes me a better developer • Keeps me thinking of behavior before implementation • TDD, BDD, more or less the same for me • It’s not about testing…..
- 9. Well-Factored Tests • Tests should follow same principles as application code • Expressive • Well-factored • DRY
- 10. What does it mean to be DRY • Don’t Repeat Yourself • Actually it is OK to repeat yourself • Just eliminate the duplication as part of your Red-Green-Refactor workflow
- 11. What are Page Objects • Wraps an HTML page in an application DSL • Allows us to write acceptance tests using application language • HTML specific bits are kept in one place • Tests are less brittle http://martinfowler.com/bliki/PageObject.html
- 12. Let’s look at some code • Denomy’s Wine Emporium • https://github.com/mdenomy/foundation-demo • Originally written to play around with Zurb Foundation’s grid system, but threw in some tests with PageObjects for this talk • To see the overall workflow check out these branches in the following order • manager-adds-event • introduce-page-objects • events-on-homepage • order-events • limit-events-on-homepage • base-page-object
- 13. Let’s look at some code User Story - Manager Creates Events As a store manager, I want create events that will be shown on the home page, so that people visit the store and buy lots of wine
- 14. Summary • Abstract the implementation of an HTML page away from your tests • Write your acceptance tests around application behaviors • Write tests with the same focus on quality as application code
- 15. References • http://martinfowler.com/bliki/PageObject.html • http://robots.thoughtbot.com/better-acceptance- tests-with-page-objects • https://code.google.com/p/selenium/wiki/ PageObjects
- 16. Writing Maintainable, Expressive Tests with PageObjects Michael Denomy @mdenomy