Check more code for coverage

* ApplicationJob should be covered by tests.
* Spec should all be executed, except `xit` which should be avoided and
  can be flagged.

.simplecov

@@ -4,10 +4,8 @@
 SimpleCov.start 'rails' do
   add_filter '/bin/'
   add_filter '/config/'
-  add_filter '/jobs/application_job.rb'
   add_filter '/schemas/'
   add_filter '/lib/generators'
-  add_filter '/spec/'
   add_filter '/vendor/'
   add_filter '/public'
   add_filter '/swagger'