RSpec testing within a block

rspec_test_within_a_block.rb

module PdfRenderer
  describe Header do
    let(:pdf) { mock(Prawn::Document) }
    subject   { Header.new(pdf) }
    
    describe "#render" do
      it "draws the header" do
        pdf.should_receive(:repeat).with(:all) do
          pdf.should_receive(:move_down) # this fails
        end
        subject.render
      end
    end
  end
end

module PdfRenderer
  class Header
    attr_reader :pdf
    def initialize(pdf)
      @pdf = pdf
    end
    
    def render
      pdf.repeat :all do 
        pdf.move_down 13.mm
      end
    end
  end
end