Test Utils with Shallow Rendering support were only added into react in 0.13, so perhaps these methods pre-date that? Test-Utils render into document require js

Test Utils with Shallow Rendering support were only added into react in 0.13, so perhaps these methods pre-date that? Test-Utils render into document require jsdom or similar to render into. It's easy to say "But 0.13 was ages ago", but in reality it was only released back in March, which may seem like an eternity to Hacker News, but in the real world isn't long at all, and not necessarily long enough for businesses to change their working practices if they already have other methods working well for them.