Add a simple unit test framework with `tox` and `pytest` #10

	name: Python checks

	on:
	push:
	branches: ["main"]
	tags-ignore: ["**"]
	pull_request:

	env:
	COVERAGE: ${{ github.workspace }}/coverage

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.9.20"]

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install tox>=4.19
	- name: Check for lint
	# Report errors but don't fail until we achieve stability!
	continue-on-error: true
	run: \|
	cd backend
	tox -e format,isort,lint
	- name: Run unit tests
	run: \|
	cd backend
	tox -e unit
	- name: Add coverage data to conversation
	run: cat $COVERAGE/coverage.txt >> $GITHUB_STEP_SUMMARY
	- name: Publish coverage data
	uses: actions/upload-artifact@v4
	with:
	name: Coverage for ${{ github.event.head_commit.id }}
	path: ${{ env.COVERAGE }}/html
	if-no-files-found: warn
	retention-days: 30

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