Use require_relative where possible

Rakefile

@@ -1,6 +1,6 @@
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 
-require File.expand_path('../config/application', __FILE__)
+require_relative 'config/application'
 
 Rails.application.load_tasks

config.ru

@@ -1,6 +1,6 @@
 # This file is used by Rack-based servers to start the application.
 
-require ::File.expand_path('../config/environment',  __FILE__)
+require_relative 'config/environment'
 run Rails.application
 
 # turn automatic que temp off

config/boot.rb

@@ -1,3 +1,4 @@
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 
 require 'bundler/setup' # Set up gems listed in the Gemfile.
+require 'bootsnap/setup'

test/test_helper.rb

@@ -10,7 +10,7 @@ if ENV['COVERAGE']
 end
 
 ENV['RAILS_ENV'] ||= 'test'
-require File.expand_path('../../config/environment', __FILE__)
+require_relative '../config/environment'
 require 'rails/test_help'
 require 'minitest/mock'
 require 'capybara/rails'
@@ -42,6 +42,9 @@ CompanyRegister::Client = CompanyRegisterClientStub
 EInvoice.provider = EInvoice::Providers::TestProvider.new
 
 class ActiveSupport::TestCase
+  # Run tests in parallel with specified workers
+  parallelize(workers: :number_of_processors)
+
   ActiveRecord::Migration.check_pending!
   fixtures :all