My use case is for Cloudflare Workers specifically, they have a max-size of 1MB per script and even while doing tests locally in node - the actual worker behave

My use case is for Cloudflare Workers specifically, they have a max-size of 1MB per script and even while doing tests locally in node - the actual worker behave differently, so the only way to really test units is by adding the tests directly to the script. So you see the dilemma with that..