content matching in iframe

Here is the scenario, i'd like to check a iframe on my page to make sure certain content exists. and i tried:

within_frame 'my_frame_name' do 
  find('#id_of_a_div').value should match 'match me please' 
end

tried a couple of variations, none w开发者_StackOverflow社区orked.

any suggestions?

within_frame 'my_frame_name' do 
  find('#id_of_a_div').value.should == 'match me please' 
end