[junitxml] logic for handling interlaced test reports in the pytest_runtest_logreport hook is xdist-specific but it could be xdist-agnostic (generic)

Description

The src/_pytest/junitxml.py::pytest_runtest_logreport() hook implemented in the pytest built-in junitxml plugin has logic to handle interlaced test reports but that logic is too xdist-specific because it expects worker_id and item_index attributes in test reports that are set only by the pytest-xdist plugin. This part of code could be fully xdist-agnostic and depending only on uniqueness of report.nodeid attribute.

This is causing issues when generating JUnit XML report file with the pytest-cocotb plugin that allows to use pytest as regression manager for cocotb tests.

Captured stdout and stderr in report.capstdout and report.capstderr where report.when in ("setup", "call") are not included in JUnit XML report file when junit_logging is set to all|system-err|system-out.

I can prepare a Pull Request and refactor that hook. And add some unit tests.

Related issue: https://github.com/cocotb/cocotb/issues/5226

pip list

Package        Version
-------------- -------------------
cocotb         2.1.0.dev0+e4b4975d
find-libpython 0.5.0
iniconfig      2.3.0
packaging      25.0
pluggy         1.6.0
pygments       2.19.2
pytest         9.0.2

OS

• Container image: registry.gitlab.com/tymonx/ghdl:latest
• Project: https://gitlab.com/tymonx/ghdl

Example

Git clone repository https://gitlab.com/tymonx/cocotb-junit-testing-ci-reports.git:

git clone https://gitlab.com/tymonx/cocotb-junit-testing-ci-reports.git

Change current working directory to it:

cd cocotb-junit-testing-ci-reports

Create environment using container image with GHDL simulator:

podman run -it --rm --workdir "$(pwd)" --volume "$(pwd):$(pwd):rw" --userns keep-id registry.gitlab.com/tymonx/ghdl:latest bash

Create Python virtual environment:

uv venv

Enter created Python virtual environment:

. .venv/bin/activate

Install Cocotb + Pytest:

uv pip install git+https://github.com/tymonx/cocotb.git@chore/xunit-reporter pytest

Run tests and generate JUnit XML report file junit.xml:

SIM=ghdl HDL_TOPLEVEL_LANG=vhdl WAVES=1 pytest -p cocotb_tools.pytest.plugin --override-ini=junit_logging=all --override-ini=junit_family=xunit1 --junit-xml=junit.xml

Generated JUnit XML report file junit.xml should contain COCOTB_RANDOM_SEED string in captured stderr:

grep COCOTB_RANDOM_SEED junit.xml

• a detailed description of the bug or problem you are having
• output of pip list from the virtual environment you are using
• pytest and operating system versions
• minimal example if possible

Start in src/_pytest/junitxml.py at pytest_runtest_logreport() and read the report fields defined in src/_pytest/reports.py, especially nodeid, capstdout, and capstderr. Reproduce the issue with the provided cocotb command, then add unit tests covering interlaced reports and verify that the captured output appears in junit.xml for the requested junit_logging modes.