The puppet_facts gem implicitly depends on the json gem. On Ruby 1.8.7, json is not built in. On Puppet 2.7, it is not explicitly pulled in by the hiera gem. So we add it here explicitly.
@@ -7,6 +7,7 @@ group :development, :unit_tests do
gem 'puppet-lint', :require => false
gem 'simplecov', :require => false
gem 'puppet_facts', :require => false
+ gem 'json', :require => false
end
group :system_tests do