Rails 4, RSpec 3.2 - How to Make an ActionMailer Layout with the_Now Delivery Method to Create Exceptions

Question

Environment

Ruby 2.2.1, Rails 4.2.0, rspec-core 3.2.2, rspec-wait 3.2.0, rspec-mocks 3.2.1, rspec-rails 3.2.1, support for rspec 3.2.2

I have the following method

def send_event_alert_email(event_id) event = Event.find_by(id: event_id) ... ... ... EventAlertMailer.event_alert(event_id).deliver_now create_alert(event) end 

I need to write specifications that ensure that create_alert(event) will not be called when EventAlertMailer.event_alert(event_id).deliver_now raises any exceptions. So, the main question is how do I model deliver_now to raise possible exceptions that it could actually fulfill.

Answer 1

Here's how to test the deliver_now method:

 describe EventAlertMailer do it 'sends email' do delivery = double expect(delivery).to receive(:deliver_now).with(no_args) expect(EventAlertMailer).to receive(:event_alert) .with(event_id) .and_return(delivery) MyClass.send_event_alert_email end end