avand-amiri-expected_named_scope.rb

  # KEEPING HERE FOR POSTERITY (_gus)

  # Allows for a named_scope chain like this,
  #   Business.owned_by(current_user).limit(10)
  # to be cleanly tested like this,
  #   assert_named_scope_chain(Business, { :owned_by => current_user }, { :limit => 10 })
  # rather than having to create nasty mock objects.
  def expected_named_scope_chain(*ordered_chain)
    results = []
    
    ordered_chain.reverse.each_with_index do |named_scope_link, i|
      last = i == (ordered_chain.size - 2)
      link = last ? ordered_chain.first : mock()
      
      if named_scope_link.is_a? Hash # e.g. Business.limit(10) aka { :limit => 10 }
        expectation = named_scope_link.first.first # e.g. :limit
        param       = named_scope_link.first.last  # e.g. 10
        
        link.expects(expectation).with(param).returns(results)
      else # e.g. Business.claimed aka :claimed
        expectation = named_scope_link # e.g. :claimed
        
        link.expects(expectation).returns(results)
      end
      
      break if last
      
      results = link
    end
  end