Now that we are starting to develop features and modules for workers, we need a simple testing mechanism for workers, preferably one with a feature set comparable to SimpleTest.
Would be interesting to see if we could make testharness.js easy to use in workers
The worker tests I've written that use testharness are basically a bad way to write tests, since the harness doesn't have native support. I recall discussing this with jgraham for possible implementation strategies but don't remember the details.
I started poking at this: https://github.com/Ms2ger/testharness.js/tree/worker-support