Gemfile in tidy_json-0.5.1 vs Gemfile in tidy_json-0.5.2

@@ -4,9 +4,11 @@
 
 gemspec
 
 group :test do
   gem 'rake'
+  gem 'test-unit', '~> 3.4'
+  gem 'yard', '~> 0.9'
 end
 
 group :development do
   install_if -> { ENV['COVERAGE'] } do
     gem 'simplecov'