We were using mocha which presented some challenges and less than good experience when it came to testing. We're moving to vitest and we're also using Typescript in our testing to easily catch some of the typing issues that might arise earlier.

We're also adding a coverage so later we can setup CI to take that into consideration.

Added capacity to use Worker for Healthchecks. We also allow users to override the worker URL so they are able to modify it as they see fit.