[Test] Improve test

[conico974]

Right now only e2e test work and not everything is properly covered (It's almost impossible to cover everything anyway with e2e given the number of possibilities)

• Fix the unit test package and integrate it in GH actions
• We could run a lot more e2e test by running them locally on node
• Try to cover as much as possible the routing part with unit test

If someone has other ideas on how to improve testing, i'm all ears

[socsieng]

I'm keen to contribute

[conico974]

@socsieng The easiest one to start with would be the unit test https://github.com/opennextjs/opennextjs-aws/tree/main/packages/tests-unit/tests
All the tests here are broken and needs to be ported for OpenNext v3. It's probably easier to just start over.
What we should cover in unit test are all the converters (maybe not the edge one for now), and most of the things in core/routing (not the middleware) that would already be a great start.

You need to use pnpm 8 though (pnpm 9 cause some trouble)

[socsieng]

Thoughts about colocating the tests with the code instead of in a separate package?

[conico974]

Not a big fan at all personally. Separate package makes things a bit cleaner

[socsieng]

I've had a go at just fixing the existing tests: #551

Wanted to confirm that this is what you wanted before proceeding.