Gemfile in message_bus-2.2.3 vs Gemfile in message_bus-2.2.4

@@ -1,12 +1,14 @@
+# frozen_string_literal: true
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in message_bus.gemspec
 gemspec
 
 group :test do
   gem 'minitest'
   gem 'minitest-hooks'
+  gem 'minitest-global_expectations'
   gem 'rake'
   gem 'http_parser.rb'
   gem 'thin'
   gem 'rack-test', require: 'rack/test'
   gem 'jasmine'