Test against Pyodide in CI

[Zac-HD]

Pyodide makes it easy to use Python code in your browser, which is great for demos like https://zhd.dev/ghostwriter/. It does also work a little differently to other platforms though, what with e.g. not having files, and so it would be nice to run our tests in CI to confirm that everything is working (to the extent possible).

Proof-of-concept for pytest in the browser: https://github.com/pydantic/pydantic-core/tree/main/wasm-preview; we can probably lean on that for our own CI.

[Cheukting]

For testing in CI do we use Selenium to run those testing HTML files? I am curious and would like to help if that's ok

[Zac-HD]

I don't know any more than I wrote above! If you'd like to help, working out how to do this would be a big part of it 😅

[Cheukting]

Sounds good to me 😊

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On Thu, 20 Oct 2022 at 21:02, Zac Hatfield-Dodds ***@***.***> wrote: I don't know any more than I wrote above! If you'd like to help, working out *how* to do this would be a big part of it 😅 — Reply to this email directly, view it on GitHub <#3437 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AG3N26KBOYGVVZNMSCNRJ3TWEGJLHANCNFSM56KT7QOA> . You are receiving this because you commented.Message ID: ***@***.***>

[Zac-HD]

pytest-dev/pytest#10670 has some nice discussion about, and a working example of, using wasmtime with pytest. Looks like this is a bit less mature than I'd hoped, but it seems acheiveable this year - though we may need to start upstream in Pytest, and/or accept some disabled-on-wasm-for-now tests.

[Zac-HD]

If using wasmtime as per the pytest issue above doesn't work when we try it, we could imitate Sympy's test setup (script, actions config, runtime check). We might even want to do both, to check both wasm and pyodide-on-node 🤔

[Zac-HD]

There's now https://pyodide.org/en/stable/development/building-and-testing-packages.html#testing-packages-against-pyodide, which looks pretty doable...