Test Driving with RSpec and Cucumber

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Test-Driving with RSpec and Cucumber Monday, April 2, 12

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@terronk [email protected] Lee Edwards Lead Developer, SideTour Monday, April 2, 12

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Test-Driven Development RED GREEN REFACTOR Monday, April 2, 12

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Test-Driven Development Write a test Watch it fail Write the code Watch it pass Refactor, Refactor! RED GREEN REFACTOR Monday, April 2, 12

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Example 1 •Test-Driving Fibonacci with RSpec Monday, April 2, 12

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Ensures working code Drives good design Prevents regression Documents behavior Monday, April 2, 12

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Working Code Monday, April 2, 12

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Monday, April 2, 12

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Regressions Monday, April 2, 12

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Documentation Monday, April 2, 12

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Example 2 •Adding a new requirement to our Fibonacci method Monday, April 2, 12

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Refactoring •Changes to code guided by tests •Behavior doesn’t change •Tests stay green Monday, April 2, 12

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Example 3 •Refactoring our Fibonacci method Monday, April 2, 12

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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

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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

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Two Styles of Cukes Verbose Concise Monday, April 2, 12

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Verbose Feature Monday, April 2, 12

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Step Deﬁnitions Monday, April 2, 12

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Concise Feature Monday, April 2, 12

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Example 4 •(example Cucumber feature) •drill down into model specs Monday, April 2, 12

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Advanced TDD • Mocking and stubbing • let statements • Factories and Fixtures Monday, April 2, 12

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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

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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

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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

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Unit Testing • Ruby RSpec, Test::Unit • Python PyUnit, unittest • Java JUnit • Javascript Jasmine • iOS OCUnit, Cedar • Android Robolectric Monday, April 2, 12

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Integration Testing • Rails Cucumber, Steak, RSpec • Django SeleniumRC • Android Robotium • iOS Frank, iCuke, KIF Monday, April 2, 12