event_list.rb

require File.expand_path('./interactions.rb', File.dirname(__FILE__))

module Interactions
  class EventList < Interaction
    def event_on_page? artist, venue, date=nil
      event_on_page_all? [artist, venue, date].reject
    end
    
    def event_on_page_all? all_content
      with_cuke do
        on_page = false
        all('table.event-list tr').each do |tr|
          index_of_nil = all_content.map do |content|
            tr.text =~ /#{content}/
          end.index(nil)
          if index_of_nil.nil?
            on_page = true
          end
        end
        on_page
      end
    end
  end
end

event_list_steps.rb

Then /^I (should|should not) see the following events:$/ do |should_or_should_not, table|
  should_it_be_there = should_or_should_not == "should"

  interactor = Interactions::EventList.new(self)

  table.hashes.each do |row|
    unless interactor.event_on_page?(row["artist"], row["venue"], row["date"]) == should_it_be_there
      raise "Wrong results for #{row.inspect}"
    end
  end
end