gistfile1.rb

  spec_acts_as_plugin(:acts_as_billable) do |plugin|
    plugin.should require_methods(
      :billable_amount,
      :billable_description,
      :billable_type,
      :billable_user,
      :billable_mfk
    )

    plugin.should define_methods(
      :billed?
    )

    plugin.with(:bill_by_date => true).should require_columns(
      [:effective_start_date, :datetime],
      [:effective_end_date,   :datetime],
      [:quantity,             :integer]
    )
  end