How to test ActionMailer deliver_later with rspec
Using ActiveJob and rspec-rails
3.4+, you could use have_enqueued_job
like this:
expect {
YourMailer.your_method.deliver_later
# or any other method that eventually would trigger mail enqueuing
}.to(
have_enqueued_job.on_queue('mailers').with(
# `with` isn't mandatory, but it will help if you want to make sure is
# the correct enqueued mail.
'YourMailer', 'your_method', 'deliver_now', any_param_you_want_to_check
)
)
also double check in config/environments/test.rb
you have:
config.action_mailer.delivery_method = :test
config.active_job.queue_adapter = :test
Another option would be to run inline jobs:
config.active_job.queue_adapter = :inline
But keep in mind this would affect the overall performance of your test suite, as all your jobs will run as soon as they're enqueued.
If I understand you correctly, you could do:
message_delivery = instance_double(ActionMailer::MessageDelivery)
expect(ServiceMailer).to receive(:new_user).with(@user).and_return(message_delivery)
allow(message_delivery).to receive(:deliver_later)
The key thing is that you need to somehow provide a double for deliver_later
.