Add documentation on writing tests for Breathe (#931) #925

	name: unit tests
	on: [push, pull_request]
	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version:
	- '3.8'
	- '3.9'
	- '3.10'
	- '3.11'
	- '3.12'
	sphinx-version:
	- '5.0.2'
	- '5.1.1'
	- '5.2.3'
	- '5.3.0'
	- '6.1.3'
	- git+https://github.com/sphinx-doc/sphinx.git@master

	steps:
	- uses: actions/checkout@v4
	- name: set up python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip'

	- name: install dependencies
	run: \|
	pip install ".[test]"

	- name: install sphinx from PyPI or from git
	run: \|
	if echo "${{ matrix.sphinx-version }}"\|grep -q git; then
	pip install ${{ matrix.sphinx-version }}
	else
	pip install -Iv Sphinx==${{ matrix.sphinx-version }}
	fi

	- name: run the unit tests
	run: make dev-test

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