Описание тега enzyme
Unit Test Library for ReactJS. It is developed by Airbnb. It can be used with other JS Testing frameworks like Mocha, Jest, Karma etc.
Enzyme is a JavaScript testing utility for React that makes it easier to assert, manipulate, and traverse your React components' output.
Enzyme's API is meant to be intuitive and flexible by mimicking jQuery's API for DOM manipulation and traversal.
Enzyme is unopinionated regarding which test runner or assertion library you use, and should be compatible with all major test runners and assertion libraries out there. The documentation and examples for enzyme use Mocha and Chai, but you should be able to extrapolate to your framework of choice.