Karma is deprecated

Describe the bug Our test runner, Karma, has been deprecated for over a year. It is now starting to break, with Chai moving to modules and none of the bindings between Karma and Chai seem to be maintained to handle this transition.

To Reproduce Steps to reproduce the behavior:

1. Run npm test
2. Tests fail to run, complaining about module import/export

Expected behavior Tests run just fine.

Client (please complete the following information): N/A

Server (please complete the following information): N/A

Additional context https://github.com/karma-runner/karma#karma-is-deprecated-and-is-not-accepting-new-features-or-general-bug-fixes