Testing email: last email is nil when sent through a background worker

Question

I'm trying to add some tests for email using this railscast, however I'm getting `undefined method 'to' for nil:NilClass`. The emails are actually processed through a background worker using Sidekiq and I know that they send properly since they work in production and also they would send before I added `require 'sidekiq/testing'` to `spec_helper.rb` So basically my problem is how do I access the email in Sidekiq? I've tried to let the workers process the email but still got the same error. spec/support/mailer_macros.rb ``` module MailerMacros def last_email ActionMailer::Base.deliveries.last end def reset_email ActionMailer::Base.deliveries = [] end end ``` spec/spec_helper.rb ``` require 'sidekiq/testing' ... config.include MailerMacros config.before(:each) { reset_email } ``` config/environments/test.rb ``` config.action_mailer.delivery_method = :test config.action_mailer.default_url_options = { host: 'localhost:8080' } ``` controllers/tickets_controller.rb ``` def create @ticket =…

Accepted Answer

When requiring `sidekiq/testing` and not `sidekiq/testing/inline`, the jobs are put on the queue but not executed until a command like this is given:

```
Sidekiq::Extensions::DelayedMailer.drain
```

I use a helper method like this in my specs:

```
def process_async
  EventWorker.drain
  Sidekiq::Extensions::DelayedMailer.drain
end
```

Where EventWorker might be a custom worker in my app, and `Sidekiq::Extensions::DelayedMailer` is where delayed mails go by default with Sidekiq.

I can then have a spec like this:

```
#do stuff that should send an email and trigger other sidekiq events
...
process_async
...
#assert the email was sent correctly
```

There is a great explanation of all this on the SideKiq wiki: https://github.com/mperham/sidekiq/wiki/Testing

Testing email: last email is nil when sent through a background worker

Solution

Problem