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pytest-based infrastructure for running blazingly fast unit tests (seconds) on the backend, in addition to end to end test.
I have used aider to write some initial tests for core functionality (context, emitter, user_session).
Coverage isn't nearly complete, also as I hit some potential bugs which are way beyond the scope of this already quite outsized patch. More tests are in the pipeline, obviously.
For now, I propose this to have infra allowing us to require coverage on modified code and regressions for bugs. That should allow us to significantly bump up velocity while unblocking maintainers. It also paves the way to run tests on multiple versions of Python #1214, FastAPI etc., allowing us to broaden support.
Closes #1134.