node-react-shallow-renderer 16.15.0~18.2.0+dfsg+~cs88.72.123-1 (amd64 binary) in ubuntu oracular

 When writing unit tests for React, shallow rendering can be helpful.
 Shallow rendering permits one to render a component "one level deep" and
 assert facts about what its render method returns, without worrying about
 the behavior of child components, which are not instantiated or rendered.
 This does not require a DOM.