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test(pyodide): add real WASM execution and browser smoke coverage #341
Description
Verify PyodideBridge with actual Pyodide execution before extending browser behavior.
The reviewed conformance suite executes the embedded bootstrap under CPython. Other Pyodide unit tests mock loadPyodide. This is a coverage gap, not a reproduced runtime defect.
Acceptance criteria:
- Add a dedicated CI job with a pinned Pyodide version and actual PyodideBridge.
- Execute standard-library calls, byte envelopes, supported JSON scientific values, and structured Python errors.
- Cover bootstrap failure and bridge disposal.
- Fail explicitly when required packages or runtime assets are missing.
- Keep the CPython conformance test as a fast shared-core check.
- Add a real browser smoke for browser loading and a generated call. Node-hosted Pyodide alone does not establish browser behavior.
- Documentation distinguishes mocked tests, CPython checks, Node-hosted WASM, and real browser coverage.
Land this evidence before claiming browser coroutine support in #338.
Architectural approach:
Supply actual Pyodide and browser evidence for #344 where those environments are claimed. Keep backend-specific coverage distinctions explicit. Coordinate through #345.
Activity
bbopen commentedon Sep 20, 2026
Required CI now runs pinned actual Pyodide and a real Chromium generated call. Coverage includes stdlib, bytes, scientific JSON, structured errors, bootstrap failure, disposal, missing packages/assets, coroutine execution, and cancellation. Missing runtime assets fail the checks. The browser guide distinguishes mocked, CPython, WASM, and browser coverage and documents JSON-only scientific transport.
Evidence:
test/runtime_pyodide_real.conformance.ts,test/runtime_pyodide_browser.conformance.ts,.github/workflows/ci.yml, anddocs/guide/runtimes/browser.md.Verified release evidence:
0861ebeand mergef6f811dhave identical trees.The architecture decision records the accepted scope and prototype limits.
Closing with the implemented and verified 0.11 release outcome.