Test sidetiq -- coderwall.com/p/nqpa-w

hard_worker_spec.rb

class HardWorker
  include Sidekiq::Worker
  include Sidetiq::Schedulable

  recurrence { hourly }

  def perform
    # Do some work
  end
end

describe HardWorker do

  describe 'scheduling' do
    it 'will be scheduled hourly' do
      valid, invalid = times

      expect(next_occurrence).to eq valid
      expect(next_occurrence).not_to eq invalid

      Timecop.freeze(Time.zone.now + 1.hour)

      # Testing the past time is no longer valid
      expect(next_occurrence).not_to eq valid

      valid, invalid = times(2.hours)

      expect(next_occurrence).to eq valid
      expect(next_occurrence).not_to eq invalid
    end
  end
  
  private

  def next_occurrence
    HardWorker.schedule.next_occurrence
  end

  def times(offset = 1.hour)
    valid = Time.zone.now.beginning_of_hour + 1.hour
    invalid = valid + 1.minute

    [valid, invalid]
  end
end