This document discusses test driven development (TDD) for Ruby on Rails applications. It introduces TDD principles like the three laws and red-green-refactor cycle. It then provides an overview of testing tools for Rails like RSpec and Capybara for writing unit and integration tests. Additional tools that help with the testing workflow are also covered, such as Spork and Guard. The document demonstrates how to run tests directly from Sublime Text and provides references for further reading on TDD and Rails testing.

1. Rails Automatic Test Driven
Development
• About the author
• Test Driven Development
• Testing for Rails
• RSpec & Capybara
• Spork & Guard
• Test inside Sublime Text
• Show time
• References
• Q&A

2. About the author
• Tyler Long (龙泰勒)
• 6 years of software development experience
• 2 years as Senior Software Development
Manager
• Home page: http://tylerlong.me
• Weibo.com: @龙泰勒
• Github: https://github.com/tylerlong
• Bitbucket: https://bitbucket.org/tylerlong

3. Test Driven Development - 1
• Three laws of TDD
– First Law: You may not write production code until
you have written a failing unit test.
– Second Law: You may not write more of a unit test
than is sufficient to fail, and not compiling is
failing.
– Third Law: You may not write more production
code than is sufficient to pass the current failing
test.

4. Test Driven Development - 2
• The TDD Cycle
– We first write a failing test, represented in many
testing tools by the color red.
– We then implement code to get the test to
pass, represented by the color green.
– Finally, if necessary, we refactor the
code, changing its form without changing its
function.
– This cycle is known as “Red, Green, Refactor”.

5. Testing for Rails
• Test::Unit
– lightweight and straightforward
• RSpec (my choice)
– has a lot of stuff which makes testing easier
• Cucumber
– good for making sure all these sort of high-level
features and functionalities are covered

6. RSpec & Capybara
• RSpec
– RSpec is designed to make Test-Driven
Development a productive and enjoyable
experience
– http://rspec.info/
• Capybara
– Capybara makes it easy to simulate how a user
interacts with your application.
– http://jnicklas.github.com/capybara/

7. Spork & Guard
• Spork
– A DRb server for testing frameworks (RSpec /
Cucumber currently) that forks before each run to
ensure a clean testing state.
– https://github.com/sporkrb/spork
• Guard
– Guard is a command line tool to easily handle
events on file system modifications
– https://github.com/guard/guard

8. Test inside Sublime Text
• Sublime Text
– Sublime Text is a sophisticated text editor for
code, html and prose.
– I switched from Vim to Sublime Text
• Run tests directly inside the editor, doesn’t it
sound cool?
– https://github.com/maltize/sublime-text-2-ruby-
tests

9. Show Time - 1

10. Show Time - 2

11. References
• Ruby on Rails Tutorial:
http://ruby.railstutorial.org/chapters/static-
pages?version=3.2
• The true meaning of TDD:
http://tylerlong.me/1331043344/
• Rails TDD (In Chinese):
http://tylerlong.me/1332078416/

12. Q&A
• Any Questions?