article_index.rb

class ArticleIndexTest < ActiveSupport::TestCase
  def setup
    # create a parent page, which will display our index list
    page_index = Cms::Page.new(
      :slug => "top_page", 
      :label => "Page Top")
    page_index.save!

    # create Children, so we have something to list
    (3.times).each { |i| 
      children << Cms::Page.new(
        :parent => page_index, 
        :slug => "child_page_#{i}", 
        :label => "Page #{i}")
    }
    children.save!
  end

  def test_list_items
    # Does the method return something containing our expected data?
    assert_select ArticleIndex.list_articles, "child_page_1"
    assert_select ArticleIndex.list_articles, 'label', "Page 1"
  end
end

class ArticleIndex
  def list_articles
    articles = Articles.find(:parent => page_index)
    articles.each { |article|
      "<a href='#{article.path}' id='#{article.slug}'>#{article.label}</p>"  
    } 
  end
end