Rspec and capybara selected value

I want to assert if certain select has certain value and not text. This works if I assert by text :

it 'should be true' do
   should have_select("country", :selected => 'Brazil')
end

My select html is like this :

<select name="user[country]" id="country">
  <option value="BR">Brazil</option>
 ...
</select>

I want to assert does page have select with selected value, how can I do that?