react-focus-on: "Sidecar medium was not found" when running unit tests with jest

Hello! I recently added this library to add accessibility features to a modal dialog component (and it works like a charm, thanks!) but I’m having some issues with the tests that use that component. The tests are now failing with the error Sidecar medium was not found.

Using react-testing-library and jest. The test also gives some warnings about updates to sidecar not being wrapped inside an act function, which they are so that seems strange too

Warning: An update to Sidecar inside a test was not wrapped in act(...).
      
When testing, code that causes React state updates should be wrapped into act(...):
      
      act(() => {
        /* fire events that update state */
      });
      /* assert on the output */

Unfortunately the error messages aren’t very helpful so I would appreciate some advice

Thanks