RSpec with ActiveJob

foo_spec.rb

describe Foo do
  describe '.process', active_job: true do
    it 'キューにジョブを2件保存する' do
      expect {
        described_class.process
      }.to change{ActiveJob::Base.queue_adapter.enqueued_jobs.size}.by(2)
    end
  end
end

rails_helper.rb

RSpec.configure do |config|

  # メタデータ active_job: true が設定されたテストの実行前後で
  # ActiveJobのテスト用前処理を行う
  # https://github.com/rails/rails/blob/master/activejob/lib/active_job/test_helper.rb
  config.before(:all, active_job: true) do
    @old_queue_adapter = ActiveJob::Base.queue_adapter
    ActiveJob::Base.queue_adapter = :test
    queue_adapter = ActiveJob::Base.queue_adapter
    queue_adapter.enqueued_jobs.clear
    queue_adapter.performed_jobs.clear
  end

  config.after(:all, active_job: true) do
    ActiveJob::Base.queue_adapter = @old_queue_adapter
  end

end