assert_select_in_order.rb

def assert_select_elements_in_order(selector, values, options={})
  options.reverse_merge!(:starting_from_index => 1)
  
  values.each_with_index do |value, index|
    position = options[:starting_from_index] + index
    assert_select "#{selector}:nth-of-type(#{position})", value,
      "Expected value at #{selector}:(n=#{position}) to be #{value}"
  end
end

# <ul id="list">
#   <li>Foo</li>
#   <li>Bar</li>
#   <li>Baz</li>
# </ul>
#
# assert_select_elements_in_order("#list li", %w{Foo Bar Baz})
#
# <ul id="list">
#   <li>Not relevant</li>
#   <li>Foo</li>
#   <li>Bar</li>
#   <li>Baz</li>
# </ul>
#
# assert_select_elements_in_order("#list li", %w{Foo Bar Baz}, :starting_at_index => 2)