Test Driving with RSpec and Cucumber

Talked given to NYU Hackdays aimed at demonstrating the principles of BDD/TDD to early programmers. Demos at: https://github.com/ledwards/HackdaysTDD

Transcript

1. Test-Driving with RSpec and Cucumber Monday, April 2, 12
2. @terronk lee@sidetour.com Lee Edwards Lead Developer, SideTour Monday, April 2, 12
3. Test-Driven Development RED GREEN REFACTOR Monday, April 2, 12
4. Test-Driven Development Write a test Watch it fail Write the code Watch it pass Refactor, Refactor! RED GREEN REFACTOR Monday, April 2, 12
5. Example 1 •Test-Driving Fibonacci with RSpec Monday, April 2, 12
6. Ensures working code Drives good design Prevents regression Documents behavior Monday, April 2, 12
7. Working Code Monday, April 2, 12
8. Monday, April 2, 12
9. Regressions Monday, April 2, 12
10. Documentation Monday, April 2, 12
11. Example 2 •Adding a new requirement to our Fibonacci method Monday, April 2, 12
12. Refactoring •Changes to code guided by tests •Behavior doesn’t change •Tests stay green Monday, April 2, 12
13. Example 3 •Refactoring our Fibonacci method Monday, April 2, 12
14. Unit tests vs. Integration tests •Unit tests cover isolated behaviors •Integration tests cover full features •Unit tests mock or stub interfaces •Integration tests validate interfaces Monday, April 2, 12
15. Cucumber •High-level integration testing for web applications •Uses a web browser driver or a web browser simulator •Natural language steps with custom definitions Monday, April 2, 12
16. Two Styles of Cukes Verbose Concise Monday, April 2, 12
17. Verbose Feature Monday, April 2, 12
18. Step Definitions Monday, April 2, 12
19. Concise Feature Monday, April 2, 12
20. Example 4 •(example Cucumber feature) •drill down into model specs Monday, April 2, 12
21. Advanced TDD • Mocking and stubbing • let statements • Factories and Fixtures Monday, April 2, 12
22. How to Learn More • Use it on your projects • Contribute to Open Source • Read a book • Get an internship at a company that TDDs Monday, April 2, 12
23. Reading • Test-Driven Development By Example by Kent Beck • Growing Object-Oriented Software, Guided By Tests by Steve Freeman • Refactoring by Martin Fowler • The RSpec Book by David Chelimsky Monday, April 2, 12
24. Setting up Rails BDD • Add to Gemfile: • rspec-rails • cucumber-rails • jasmine • bundle install • rake db:test:prepare • rails g cucumber:install • rails g rspec:install • jasmine init Monday, April 2, 12
25. Unit Testing • Ruby RSpec, Test::Unit • Python PyUnit, unittest • Java JUnit • Javascript Jasmine • iOS OCUnit, Cedar • Android Robolectric Monday, April 2, 12
26. Integration Testing • Rails Cucumber, Steak, RSpec • Django SeleniumRC • Android Robotium • iOS Frank, iCuke, KIF Monday, April 2, 12