rhburrows

module FollowEventTransitionMatcher

  class FollowEventTransition

    def initialize(event, options)
      @event = event
      @from = options[:from].is_a?(Array) ? options[:from] : [options[:from]]
      @to = options[:to]
    end
    

rhburrows

it "event something should transition from state first to state second" do
  Model.should follow_event_transition(:something, :from => :first, :to => :second)
end

rhburrows

rails movie-planning
cd movie-planning
script/generate rspec
script/generate rspec_model Movie
script/generate rspec_model Actor movie_id:integer alive:boolean
rake db:migrate
rake spec

rhburrows

# app/models/actor.rb
class Actor < ActiveRecord::Base
  belongs_to :movie
end

rhburrows

# spec/models/actor_spec.rb
require 'spec_helper'

describe Actor do
  describe "#kill" do
    it "make the actor no longer alive" do
      a = Actor.new(:alive => true)
      a.kill
      a.should_not be_alive
    end

rhburrows

# app/models/actor.rb
class Actor < ActiveRecord::Base
  def kill
    self.alive = false
  end
end

rhburrows

# spec/models/actor_spec.rb
describe Actor do
  describe "#kill" do
    before(:each) do
      @movie = mock_model(Movie).as_null_object
      @actor = Actor.new(:alive => true, :movie => @movie)
    end

    it "makes the actor no longer alive" do
      @actor.kill

rhburrows

# lib/spec/mocks/methods.rb
module Spec
  module Mocks
    module Methods
      def as_null_object
        __mock_proxy.as_null_object
      end
    end
  end
end

rhburrows

# lib/spec/mocks/proxy.rb
module Spec
  module Mocks
    class Proxy
      @options[:null_object] = true
    end
  end
end

rhburrows

# lib/spec/mocks/mock.rb
module Spec
  module Mocks
    class Mock
      def method_missing(sym, *args, &block)
        __mock_proxy.record_message_received(sym, args, block)
        begin
          return self if __mock_proxy.null_object?
	  super(sym, *args, &block)
        rescue NameError