WIP: add some test_utils to experiment with #124

	name: Test & Lint

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	max-parallel: 4
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11"]

	steps:
	# Python & dependency installation
	- uses: actions/checkout@v2
	- name: setup Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: install Poetry
	uses: snok/install-poetry@v1.2.1
	# - name: cache Poetry virtualenv
	# uses: actions/cache@v2
	# id: cache
	# with:
	# path: ~/.virtualenvs/
	# key: poetry-${{ hashFiles('**/poetry.lock') }}
	# restore-keys: \|
	# poetry-${{ hashFiles('**/poetry.lock') }}
	- name: set poetry config path
	run: poetry config virtualenvs.path ~/.virtualenvs
	- name: install dependencies
	run: poetry install

	- name: lint with mypy
	run: poetry run mypy src
	- name: lint with flake8
	run: poetry run flake8 --show-source --statistics --ignore=E203,E501,W503 src
	- name: pytest
	run: poetry run pytest

Provide feedback