gistfile1.rb

## task_spec.rb
require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
 
describe Task do
  include ValidTaskAttributes 
    # o módulo ValidTaskAttributes define o método valid_task que retorna 
    #{
    #  :name => "Task name",
    #  :description => "Task description",
    #  :alias => "task_alias",
    #  :due_date => Date.today,
    #  :priority => 1,
    #  :percentage => 9.99,
    #} 
 
  describe 'validations' do
    before :each do
      Task.create(valid_task)
    end
    
    subject { Task.new } 
  end
end
 
## task.rb
 
class Task < ActiveRecord::Base
 
  validates_uniqueness_of :name
end