TESTING PRIMER Making sense of TDD and BDD 

WHY TEST? 

COST PER CHANGE (BUGS, NEW FEATURES, ETC) Cost Time Non-TDD TDD 

COST PER TEST Models Controllers/Routes Views/Helpers Application In Browser 

ROI PER TEST Models Controllers/Routes Views/Helpers Application In Browser 

CORRELATION In Browser Acceptance Tests ??? Cucumber Capybara Selenium Application Acceptance Tests IntegrationTest ??? Cucumber Capybara Selenium Views & Helpers Integration Tests ActionView::TestCase RSpec Controllers & Routes Integration Tests ActionController::TestCase RSpec Model Unit Tests ActiveRecord::TestCase RSpec 

MAXIMIZE VALUE