output.txt

 % rspec spec.rb --format doc

Foo
  when logged in as a user
    should == "TEST VALUE"

Finished in 0.00047 seconds
1 example, 0 failures

spec.rb

require 'active_support/core_ext/array'

class FactoryGirl
  attr_accessor :options

  def self.create(model, options = {})
    new(model, options)
  end

  def initialize(model, options)
    @model = model
    @options = options
  end
end

class DatabaseCleaner
  def self.clean; end
end

def authenticated_as(roles, options = nil, &block)

  Array.wrap(roles).each do |role|
    context "when logged in as a #{role}" do
      before(:all) {
        options = self.instance_eval &options if options.is_a? Proc
        @user = FactoryGirl.create role, *Array.wrap(options)
      }
      after(:all)  { DatabaseCleaner.clean }

      before(:each) { @active_user = @user }
      after(:each)  { @active_user = nil }

      instance_eval &block
    end
  end
end

describe "Foo" do
  let(:test_val) { "Test Value" }
  authenticated_as :user, Proc.new{ {value: test_val.upcase} } do
    specify {
      @active_user.options[:value].should == "TEST VALUE"
    }
  end
end