RSpec 2.11 .any_instance.should_not_receive bug

tester_spec.rb

class Tester
  def initialize(dont_do_it)
    do_something unless dont_do_it == false
  end

  def do_something
    puts "Doing it..."
  end
end

describe Tester do
  describe '#initialize' do
    context 'dont_do_it is true' do
      it 'calls do_something' do
        Tester.any_instance.should_receive(:do_something)
        Tester.new(true)
      end
    end

    context 'dont_do_it is false' do
      it 'does not call do_something' do
        Tester.any_instance.should_not_receive(:do_something)
        Tester.new(false)
      end
    end
  end
end