assert_url_has_param

gistfile1.rb

##
# Passes if +url+ contains +param+ in its query string.
#
# Example:
#   assert_url_has_param("http://google.com/?q=RTFM", 'q=RTFM')
def assert_url_has_param(url, param, message = nil)
  message = build_message message, "<?> does not contain param <?>", url, param
  assert_block message do
    URI.parse(url).query.split('&').any?{|p| p == param}
  end
end

# Live example:
should "include campaign id for Omniture in all links" do
  assert_select "a[href]" do |links|
    links.each do |a|
      assert_url_has_param a.attributes["href"], "cid=100500"
    end
  end
end