As I refactor circulation-web's components from class to functional with hooks, Enzyme/Mocha, the current test stack doesn't serve our needs as well. I plan to slowly transition to more modern technologies, RTL/Jest, which tests based on user interaction and the DOM, rather than implementation details.

This ticket is specifically to set up RTL/Jest – future tickets will cover migrating tests for specific portions of circlation-web.

Acceptance criteria:
1. Install proper libraries.
2. Write config file for Jest.
3. Get one test to pass with RTL/Jest.
4. Ensure Enzyme/Mocha tests still work/pass.