The step definitions below allow you to write this in both Webrat and Capybara:

When I follow "Download as PDF"
Then I should get a response with content-type "application/pdf"

Capybara

Then /^I should get a response with content-type "([^"]*)"$/ do |content_type|
  page.response_headers['Content-Type'].should == content_type
end

Webrat

Then /^I should get a response with content-type "([^"]*)"$/ do |content_type|
  response.content_type.should == content_type
end

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

Read more Show archive.org snapshot

Unfortunatly this does not work with the Selenium webdriver.