Thanks Florian, It took me a while to digest everything you brought up - and to get things working.
However, it was just what I needed. Thanks a bunch, Rob On Mon, Aug 3, 2020 at 2:20 AM Florian Bruhin <m...@the-compiler.org> wrote: > Hey Rob, > > On Sat, Aug 01, 2020 at 11:16:52PM -0700, Rob McDonald wrote: > > According to Google, 'How does pytest discover tests' is an oft-asked > > question. However most of those questions actually want to know 'What > > criteria does pytest use to discover tests'... > > > > I'm working on a program that needs to scan a directory structure for > > Python code and then execute some of that code -- much like pytest does. > > So, I'd like to know _how_ does pytest discover (and run) tests. > > > > I've searched around in the source for where this happens, but I haven't > > had any luck. Much appreciated if someone can point me to the relevant > > bits of code? Otherwise, any pointers on best practices and > > functions/methods to use for this sort of thing are appreciated. > > Most of it happens in pytest's internal "python" plugin: > > https://github.com/pytest-dev/pytest/blob/master/src/_pytest/python.py > > For a simpler example how pytest's collection tree works, see: > > https://docs.pytest.org/en/latest/reference.html#collection-hooks > https://docs.pytest.org/en/latest/example/nonpython.html > > Finally, you might be interested in Oliver Bestwalter's talk "Abridged > metaprogramming classics - this episode: pytest": > > https://github.com/obestwalter/abridged-meta-programming-classics > > There, Oliver implements a small subset of pytest's "magic" from scratch. > > Note, however, that there are various utility functions available in the > stdlib > (inspect, importlib, pkgutils) which make those kinds of tasks easier, at > least > with Python 3.5+. However, both pytest and Oliver's talk avoid them > (because of > Python 2 support and because it was a fun limitation, respectively). > > For a more straightforward implementation, you can roughly: > > - Use pkgutil.walk_packages to find modules > - Use importlib.import_module to import them > - Use inspect.getmembers to get e.g. functions > > I do the first two in my own project here: > > https://github.com/qutebrowser/qutebrowser/blob/master/qutebrowser/extensions/loader.py > > Florian > > -- > m...@the-compiler.org (Mail/XMPP) | https://www.qutebrowser.org > https://bruhin.software/ | > https://github.com/sponsors/The-Compiler/ > GPG: 916E B0C8 FD55 A072 | https://the-compiler.org/pubkey.asc > I love long mails! | https://email.is-not-s.ms/ >
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