Consider switching from Enzyme to React-Testing-Library

[glebec]

See https://github.com/kentcdodds/react-testing-library for info

[collin]

@fterdal and I are both big on blessing react-testing-library.

I do think this should not precede moving away from enzyme across all curriculum :(

[fterdal]

Mayhaps a good first step would be creating a React checkpoint using it react-testing-library and seeing how it flies? I've got my eyes on refactoring the checkpoints anyway.