How to test whether Mailer is enqueued 【Ruby on Rails】

Suppose we develop mailer functions and want to test it, what should we do?

Useful way

ActiveJob::TestHelper

The answer is below. The code is following the library above.

RSpec.describe 'test', type: :request do
  include ActiveJob::TestHelper
  
  context 'test1' do
    def call
      # ....some mailer functions
    end
    it 'send an email' do
      expect { call }.to have_enqueued_job.on_queue('mailers')
      expect(enqueued_jobs.size).to eq 1
    end
  end
end

have_enqueued_job returns…

[{:id=>"xxxxxxxxxxxxxxxx", :job=>ActionMailer::DeliveryJob, :args=>["Mailer", "method", "deliver_now", {"_aj_globalid"=>"gid://product/class/:id"}], :queue=>"mailers"}]

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