events_helper.rb

module EventsHelper
  def events_list(events)
    content_tag(:ul) do
      events.inject('') do |list_content, event|
        list_content << event_list_item(event)
      end
    end
  end

  private

    def event_list_item(event)
      content_tag(:li) do
        item_content = content_tag(:h3, link_to(event.name, ''))
        item_content << event_details(event)
      end
    end

    def event_details(event)
      content_tag(:div, :class => 'content') do
        details_content = event.picture? ? image_tag(event.picture.url) : ''
        details_content << simple_format(event.description)
      end
    end
end

events_helper_test.rb

require 'test_helper'

class EventsHelperTest < ActionView::TestCase
  context 'Given events' do
    setup do
      3.times { Factory(:event) }
      @events = Event.all
    end

    context 'when displaying the events' do
      setup { get_events_list }

      should 'show all events' do
        assert_select 'ul', :count => 1 do
          assert_select 'li', :count => @events.size
        end
      end

      should 'link each event title' do
        @events.each do |event|
          assert_select "li h3 a[href=]", :count => 1, :text => event.name
        end
      end

      should 'show the event details' do
        assert_select 'li div.content', :count => @events.size do
          @events.each do |event|
            assert_select 'p', :count => 1, :text => event.description
          end
        end
      end

      should 'not show a picture' do
        assert_select 'img', :count => 0
      end
    end
  end

  context 'Given an event with line breaks in the description' do
    setup do
      Factory :event, :description => <<-EOS
This is some text.

This is more text.
Break.
EOS

      @events = Event.all
      get_events_list
    end

    should 'format the description' do
      assert_select('div.content p', :count => 2) do
        assert_select 'br', :count => 1
      end
    end
  end

  context 'Given an event with a picture' do
    setup do
      Factory :event_with_picture
      @events = Event.all
    end

    context 'when displaying the events' do
      setup { get_events_list }

      should 'show the picture' do
        event = @events.first
        assert_select 'li div.content img[src=?] + p',
          %r{/system/events/pictures/#{ event.id }/normal/#{ event.picture_file_name }\?\d+},
          :count => 1
      end
    end
  end

  private

  	def get_events_list
  		set_response_body(events_list(@events))
  	end
end