= Shoulda - Making tests easy on the fingers and eyes

Shoulda makes it easy to write elegant, understandable, and maintainable tests. Shoulda consists of matchers, test helpers, and assertions. It's fully compatible with your existing tests in Test::Unit or RSpec, and requires no retooling to use.

Matchers:: Test::Unit- and RSpec-compatible one-liners that test common Rails functionality.
           These tests would otherwise be much longer, more complex, and error-prone.
Helpers:: #context and #should give you RSpec like test blocks in Test::Unit.
          In addition, you get nested contexts and a much more readable syntax.
Assertions:: Many common Rails testing idioms have been distilled into a set of useful assertions.

= Usage

=== ActiveRecord Tests (Shoulda::ActiveRecord::Matchers)

Test your ActiveRecord associations and validations with these powerful matchers:

  class PostTest < Test::Unit::TestCase
    should belong_to(:user)
    should have_many(:tags).through(:taggings)

    should validate_uniqueness_of(:title)
    should validate_presence_of(:body).with_message(/wtf/)
    should validate_presence_of(:title)
    should validate_numericality_of(:user_id)
  end

  class UserTest < Test::Unit::TestCase
    should have_many(:posts)

    should_not allow_value("blah").for(:email)
    should_not allow_value("b lah").for(:email)
    should allow_value("a@b.com").for(:email)
    should allow_value("asdf@asdf.com").for(:email)
    should ensure_inclusion_of(:email).in_range(1..100)
    should ensure_inclusion_of(:age).in_range(1..100)
    should_not allow_mass_assignment_of(:password)
  end

Makes TDD so much easier.

=== Controller Tests (Shoulda::Controller::Matchers)

Matchers to test the most common controller patterns...

  class PostsControllerTest < ActionController::TestCase
    context "on GET to :show for first record" do
      setup do
        get :show, :id => 1
      end

      should assign_to(:user)
      should respond_with(:success)
      should render_template(:show)
      should_not set_the_flash

      should "do something else really cool" do
        assert_equal 1, assigns(:user).id
      end
    end
  end

=== Context Helpers (Shoulda::Context)

Stop killing your fingers with all of those underscores...  Name your tests with plain sentences!

  class UserTest < Test::Unit::TestCase
    context "A User instance" do
      setup do
        @user = User.find(:first)
      end

      should "return its full name" do
        assert_equal 'John Doe', @user.full_name
      end

      context "with a profile" do
        setup do
          @user.profile = Profile.find(:first)
        end

        should "return true when sent #has_profile?" do
          assert @user.has_profile?
        end
      end
    end
  end

Produces the following test methods:

  "test: A User instance should return its full name."
  "test: A User instance with a profile should return true when sent #has_profile?."

So readable!

=== Helpful Assertions (Shoulda::Assertions)

More to come here, but have fun with what's there.

  assert_same_elements([:a, :b, :c], [:c, :a, :b])
  assert_contains(['a', '1'], /\d/)
  assert_contains(['a', '1'], 'a')

= Rails Installation (Test::Unit)

Specify the gem dependency in your config/environment.rb file:

  Rails::Initializer.run do |config|
    config.gem "shoulda", :lib => "shoulda"
  end

Then:

  $ rake gems:install
  $ rake gems:unpack

= Rails Installation (RSpec)

If you're using Shoulda with RSpec, we recommend that you add config.gem lines
for RSpec and Shoulda in your config/environment/test.rb file, but do not ask
Rails to load the RSpec and Shoulda libraries:

  config.gem 'rspec',       :lib => false
  config.gem 'rspec-rails', :lib => false
  config.gem 'shoulda',     :lib => false

Then require shoulda from your spec/spec_helper.rb file, before Spec::Runner is
configured:

  # requires for RSpec
  require 'shoulda'
  Spec::Runner.configure do |config|
  # ...

You should not need to require anything besides the top-level shoulda library.

= Credits

Shoulda is maintained and funded by {thougthbot}[http://thoughtbot.com/community]

= License

Shoulda is Copyright © 2006-2010 Tammer Saleh, Thoughtbot. It is free software, and may be redistributed under the terms specified in the MIT-LICENSE file.