Add List The Enqueued Jobs as a rails til

rails/list-the-enqueued-jobs.md

@@ -0,0 +1,33 @@
+# List The Enqueued Jobs
+
+Many Rails apps need to delegate work to jobs that can be performed at a
+later time. Both unit and integration testing can benefit from asserting
+about the jobs that get enqueued as part of certain methods and workflows.
+Rails provides a handy helper method for checking out the set of enqueued
+jobs at any given time.
+
+The
+[`enqueued_jobs`](http://api.rubyonrails.org/classes/ActiveJob/QueueAdapters/TestAdapter.html#method-i-enqueued_jobs)
+method will provide a store of all the currently enqueued jobs.
+
+It provides a number of pieces of information about each job. One way to
+use the information is like so:
+
+```ruby
+describe '#do_thing' do
+  it 'enqueues a job to do a thing later' do
+    Processor.do_thing(arg1, arg2)
+    expect(enqueued_jobs.map { |job| job[:job] }).to match_array([
+      LongProcessJob,
+      SendEmailsJob
+    ])
+  end
+end
+```
+
+To use this in your Rails project, just enable the adapter in your test
+configuration file:
+
+```ruby
+Rails.application.config.active_job.queue_adapter = :test
+```