A quick guide for converting your existing NodeJS projects from CommonJS to ESM/ECMAScript. Including Express, Jest, Supertest and ESLint.
Jest
Full code-coverage with Jest
A guided tour on how to achieve the most complete code-coverage with Jest in your NodeJS projects and an some thoughts on why this is not necessarily the primary target.
Testing process.exit with Jest in NodeJS
Demonstrating a pragmatic way on how to test code paths resulting in process.exit using the Jest test library.