2024-07-17 here is a performance tip!
As of v24.4, mojo-pytest plugin wraps the mojo test command, actually running a new subprocess for every single test discovered. This is quite a bottleneck, so let's hope mojo test gets more optimized in the future. However an easy speed boost is to run pytest in parallel. Using the example project from the readme:
$ pip install pytest-xdist $ export PYTHONPATH=/Users/guidorice/mojo/mojo-pytest/example_src/ $ pytest -n auto --mojo-include build/ example_tests/ ============================ test session starts ============================= platform darwin -- Python 3.12.4, pytest-8.2.2, pluggy-1.5.0 rootdir: /Users/guidorice/mojo/mojo-pytest plugins: xdist-3.6.1, mojo-24.4.0 8 workers [6 items] ...... [100%] ============================= 6 passed in 3.15s ==============================
which is about a 2X speedup on my dev laptop. 🚀