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RSpec and Rails
 

RSpec and Rails

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Presentation on using RSpec with Rails. Assumes basic RSpec knowledge.

Presentation on using RSpec with Rails. Assumes basic RSpec knowledge.

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    RSpec and Rails RSpec and Rails Presentation Transcript

    • RSpec and Rails
      Alan Hecht
      http://alanhecht.me
    • Installation
      RSpec 2.5
      Only works with Rails 3
      rspec and rspec-rails
      gem install rspec-rails
      What if you’re using Rails 2.x?
      Need to install RSpec 1.3
    • Creating a Rails Project
      rails new cart_rspec
      Edit the Gemfile
      bundle install
      rails generate rspec:install
    • Railswizard.org
      Railswizard.org allows you to specify options when creating a Rails 3 project
      Rails 3 allows for flexibility in what’s used
      Database/ORM
      ActiveRecord, Mongomapper
      Unit Testing Framework
      TestUnit, Rspec
      JavaScript Framework
      jQuery, Prototype
    • Set up the project
      Use railswizard to create a template
      We’ll be creating the shopping cart
      Create rvmrc file
      bundle install
      Git setup
    • Set up the Product & Cart
      Generate product scaffolding
      Generate cart scaffolding
      Generate line_item scaffolding
      RSpec tests were created with scaffolding
      Commit changes
    • RSpec - Models
    • Run Tests
      Update database
      rake db:migrate
      Run RSpec
      rake spec
    • RSpec Options
      In .rspec file
      Documentation format
      --format doc
      HTML format
      --format html:/path/to/file
    • RSpec – Models
      Most similar to using RSpec without Rails
      Everything we learned from the calculator example applies
      Business logic testing should take place in the models
    • RSpec - Models
    • RSpec – Fixtures
      Fixture files go in spec/fixtures
      Need to explicitly load fixtures
      Can load all the fixtures for tests
      Add ‘config.global_fixtures = true’ to spec_helper.rb
    • RSpec - Controllers
      In Rails Test::Unit, Controllers and Views tested together in functional tests
      For RSpec, each is tested separately
      Outer describe contains the controller class
      Needed to run the tests
      Describe in each test has controller action
      Doesn’t affect the test, only by convention
    • Controller Matchers
      RSpec has matchers specifically for controller testing:
      response.should be_success
      response.should be_redirect
      response.should redirect_to(url)
      response.should render_template(‘app/views/products/index’)
      response.should render_template(:partial => “show_cart”)
    • Controllers - Example
    • Stubs – What are they?
      A fake object that returns a pre-determined value for a method call
      Actual object is not called
      Stubs and mocks often used interchangeably
      Mean two different things
      But people generally refer to “Mock Object Frameworks”
    • Stubs – Why?
      Separation of concerns
      Controller doesn’t depend on model
      Models don’t depend on each other
      Each model can be tested in isolation
      Don’t need the database for testing
      Faster tests
      Could use stubs to simulate a network or web service response
    • Stubs – Implications
      Need to have integration tests
      All of your tests could pass, but the site may not function
      Webrat (used by Cucumber) & Capybara are two such integration tools
    • Mocks
      Just like Stubs, but with an expectation to be (or not to be) called
      Test will fail if the mock is (or isn’t) called
      Used in the same way as stubs
    • RSpec - Views
      Verify the presence of fields on the view
      Avoid relying on the layout of the view
      View could break from a design change
      But good for testing groups of elements with a common purpose (like options fields that expand or hide)
      Use XPath or CSS selectors to locate tags
      Strongly recommend CSS selectors
    • RSpec - Views
    • RSpec - Views
      Describe contains view path
      Optional but useful
      If ‘render’ doesn’t contain arguments, use the comment on the describe line
    • Test Coverage
      rcov gem will show you how much of your code has been tested
      rake spec:rcov
      By default, all tests are run
      Need to modify Rakefile to cover only specific areas like models & views
      Output is in the <project>/coverage directory
      HTML viewable in a browser
      Open coverage/index.html
    • RCov - Output
    • RCov - Tips
      No need to try for 100% test coverage
      Good goal would be around 70 – 80%
    • Automatic Testing
      Autotest monitors changes to files in your project
      Every time a test is saved, the test is re-run
      Everytime app code is saved, corresponding test is run
      gem install autotest & autotest-rails-pure
      Create an autotest directory
      discover.rb
    • Autotest – Tips
      Be careful when using on a laptop
      Autotest polls for changes
      You’ll either get burnt by a hot laptop or your battery will die, whichever comes first
      On OS X, you can install autotest-fsevent, the file system change triggers autotest execution
      Growl notifications
      autotest-growl
      Add to rails root .autotest file