BDD for Rails Legacy Code

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This document discusses using Behavior Driven Development (BDD) tools like Cucumber, Webrat, and RSpec to test legacy Rails code. It provides an overview of BDD and these tools, and how they can be used to test Rails models, controllers and views through features, mocking objects, and message expectations. While useful for testing legacy code, the document notes there is no silver bullet and BDD requires ongoing changes to keep tests and code in sync.

Technology

About Me

 Lu Wei Jen
 Rails Developer
 http://blog.weijen.net
 http://www.facebook.com/
weijenlu
 Twitter: weijenlu


Agenda
•
• BDD

• BDD
• Legacy Code
• Legacy Code

Changes Changes Changes

Changes

Changes

Changes

BDD Tools for Rails

• Cucumber
• Webrat
• RSpec

Webrat:

• visit "http://rubyconf.tw"
• click_link " "

Webrat: Form

• file_in " ", :with => "weijen"
• check " "

• select " ", :from => " "

• click_button

Webrat:

• response.should contain(" ")

• response.should have_selector("img.photo")

• Waybill model #set_customer

• Waybills_controller #create

Mock Object

• my_mock = mock(name)
• my_mock = mock(name, stubs)
• my_mock = mock_model(name, stubs)

• my_mock.stub!(:msg).with(args).and_return(value)

Message Expectation

• my_mock.should_receive(:msg).with(args).and_r
eturn(value)

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