Testing Print CSS - spec/features/print_styles.rb

print_styles.rb

# Capybara is designed to test visible HTML elements, i.e. your user interface. 
# The link tags used for stylesheets are not visible to Capybara by default. 
# We need to pass visible: false to `have_selector` to tell Capybara the link element is not visible.

RSpec.describe 'Print CSS', type: :feature do
  context 'with params[:medium] == "print"' do
    it 'loads the print stylesheet with the media=screen' do
      is_expected.to have_selector(
        'link[id="print_styles"][media="screen"]',
        visible: false
      )
    end

    it 'does not load our other stylesheets' do
      # write tests to check your other stylesheets do not load
    end
  end

  context 'without params[:medium] == "print"' do
    it 'does not load the print stylesheet with media=screen' do
      is_expected.not_to have_selector(
        'link[id="print_styles"][media="screen"]', 
        visible: false
      )
    end
    
    it 'loads the print stylesheet with media=print' do
      is_expected.to have_selector(
        'link[id="print_styles"][media="print"]'
        visible: false
      )
    end
  
    it 'loads our other stylesheets' do
       # Test your other stylesheets load correctly here
    end
  end
end