Raise errors on deprecations

spec/rails_helper.rb

@@ -87,6 +87,8 @@ RSpec.configure do |config|
   # https://relishapp.com/rspec/rspec-rails/docs
   config.infer_spec_type_from_file_location!
 
+  config.raise_errors_for_deprecations!
+
   # controller specs require this to work with Devise
   # see https://github.com/plataformatec/devise/wiki/How-To%3a-Controllers-and-Views-tests-with-Rails-3-%28and-rspec%29
   config.include Devise::Test::ControllerHelpers, type: :controller