assert_select_test_helper.rb

# Rails' assert_select rocks for testing generated markup,
# but it assumes you've just rendered a view. If you want
# to use it in a plain ole' unit test, try adding the
# following to your test_helper.rb.
#
# Tip o' the Hat to Erik Ostrom for the basic idea:
# http://www.echographia.com/blog/2009/08/22/assert_select-from-arbitrary-text/

require 'action_controller'

Test::Unit::TestCase.class_eval do
  include ActionController::Assertions::SelectorAssertions

  # Supports assert_select without having to render a view.
  # Usage:
  #   assert_select_from some_html 'ul#foo' do
  #     assert_select 'li.bar'
  #   end
  def assert_select_from(text, *args, &block)
    @selected = HTML::Document.new(text).root.children
    assert_select(*args, &block)
  end
end