Migrate tests to componentRunner

[jeswin]

Component Runner based tests are cleaner, and easier to write.
We should migrate the old tests.

[spiffytech]

I can work on tests from the bottom of the alphabet upwards, if you want to go the other direction.

[jeswin]

Yeah sounds good.

Would you rate this as higher priority compared to the performance work? The performance work could be useful from a "marketing" standpoint as well. Accompanied by a clickbaity "We made forgo 5x faster with this simple trick". (No, I'm not planning to do that.)

[spiffytech]

My thought is perf would be a big win. I know I've looked at several frameworks just because I noticed them scoring well on that benchmark, and even modest rankings improvements are a nice confidence booster for prospective users.

Hopefully we spot some quick wins, and I'd say those would be the priority. That would naturally involve touching some existing tests, which can be migrated as we go.

After the quick wins, anything else might wind up happening in stages, and we can't judge priority on that until we've assessed possible gains. Tests migrations can be done incrementally too, so a tick-tock rhythm might be appropriate here.

[spiffytech]

I've got a WIP branch where I'm converting everything.