Upgrading to Rails 5 and rspec 3.7 no longer sends emails via ActionMailer::Base.deliveries - email

Question

I had a functional spec suite using rspec with a Rails 4.2.8. I upgraded to Rails 5.0.6 and rspec 3.7 accordingly.
Many of the specs work, but none of my specs that send emails actually add the email to the ActionMailer::Base.deliveries array.
I've verified that config/environments/test/rb has config.action_mailer.delivery_method = :test, which should add any sent emails to the array instead of actually sending them.
I suspect it has something to do with ActiveJob as well, because when I send an email via SomeMailer.some_method().deliver_later in my specs, it returns an ActionMailer::DeliveryJob object, but it does not add anything to the ActionMailer::Base array.
When I call SomeMailer.some_method().deliver_now, I find the emails actually are added to the ActionMailer::Base array. I'm wondering if for my specs I just need to configure them to all use deliver_now instead of deliver_later?
I've reviewed and followed the Ruby on Rails upgrade guide from 4.2 -> 5.0 and can't figure this out.
My specs with emails follow the format:
# spec/models/record_spec.rb
require "rails_helper"
describe Model do
describe "#method" do
it "sends email" do
record = Record.create(attributes = {})
RecordMailer.welcome_email(record).deliver_later
last_email = ActionMailer::Base.deliveries.last
expect(last_email.subject).eq ("Welcome")
end
end
end

Answer 1

Assuming you're including ActiveJob::TestHelper somewhere, you can wrap your deliver_later (or if in a feature spec, for example, a button click triggering the delivery) inside a perform_enqueued_jobs block:
perform_enqueued_jobs do
RecordMailer.welcome_email(record).deliver_later
end
Now your ActionMailer::Base.deliveries should contain the email sent via ActiveJob.