Sort files to require for coverage reports

Dir.glob don't guarantee the order of the files it returns
For example we have model in
app/model/rss_feed.rb and his extension in
app/model/rss_feed/import_export.rb - there is class
defined without inheriting from ApplicationRecord
so when class from import_export.rb is loaded first
is it loaded as RssFeed < Object and when
after this is app/model/rss_feed.rb loaded
it is causing error(this warning is suppressed by
silence_warnings):

TypeError: superclass mismatch for class RssFeed

and then RssFeed < ApplicationRecord is not loaded

Sorting Dir.glob guarantee order so that
files will be first then subdirectories,..
() because '.'.ord < '/'.ord
(sort is also used in eager_load!
https://github.com/rails/rails/blob/master/railties/lib/rails/engine.rb#L475)

spec/coverage_helper.rb

@@ -2,7 +2,7 @@
 
 # Require all ruby files for accuracte test coverage reports
 %w(app lib).each do |path|
-  Dir.glob(Rails.root.join(path, "**", "*.rb")) do |file|
+  Dir.glob(Rails.root.join(path, "**", "*.rb")).sort.each do |file|
     next if file.include?("/bin/") || file.include?("/spec/") || file.include?("/lib/generators/provider/templates/")
     begin
       silence_warnings { require file }