auto_refill.rb

module Jobs
  class AutoRefill < ::BaseJob

    def execute

      logger.tagged('autorefill') do
        scope_to_process.each do |prepaid|

          begin
             RefillService.new(prepaid).save!
          rescue StandardError => e
            logger.error{[e.message , e.backtrace.join("\n")].join("\n") }
          end

        end
      end
    end

    def scope_to_process
      VPDD::UserPrepaid.auto_refill
    end

  end
end

spec.rb

require 'spec_helper'

describe "Auto-Refill Job" do

  include_context :queue


  before do
    @job = Jobs::AutoRefill.first

  end

  context "run job" do

    let(:collection) {
      [instance_double("VPDD::UserPrepaid"), instance_double("VPDD::UserPrepaid")]
    }

    before do
      allow_any_instance_of(RefillService).to receive(:save!).and_return(true)
      allow_any_instance_of(Jobs::AutoRefill).to receive(:scope_to_process).and_return(collection)

      @job.run!
    end

    it "should make refill for each prepaid" do

      expect_any_instance_of(RefillService).to receive(:save!).twice.and_return(true)

    end


  end

end