Run a user pytest file as a testium item, surfacing each collected test
as a child with its own PASS/FAIL/SKIP, duration and failure message.
Mirrors the unittest item but runs pytest in a subprocess on the host
interpreter (bins.python_bin(), like py_func/lua_func) so it works across
every packaging channel. A stdlib-only pytest plugin streams collected
node-ids and per-test results over stdout via sentinels; the parent parses
them live. Params: test_file, test_method. stop_on_failure maps to -x;
disabled children are reported NORUN without running.
Wiring: TYPE_PYTEST / TYPE_PYTEST_STEP constants, test_init registration,
self-loading branch in test_set, GUI tree icon. Schema/LSP pick it up
automatically from the declarative PARAMS.
Validation: test/validation/items/pytest/ (validation venv now installs
pytest).
WIP: paused mid-feature (DESIGN.md documented; manual section pending).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
