Expand testing, refactor into`pettingzoo_api_test.py`, add pytest-xdist (performance/parallelization) #242

	# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: Python package

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	permissions:
	contents: read

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ['3.8', '3.9', '3.10', '3.11']

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install ubuntu dependencies
	run: \|
	sudo apt-get install python3-opengl xvfb
	- name: Install python dependencies
	run: \|
	pip install -e .[testing]
	- name: Test with pytest
	run: \|
	xvfb-run -s "-screen 0 1400x900x24" pytest ./test
	- name: Test installation
	run: \|
	python -m pip install --upgrade build
	python -m build --sdist
	pip install dist/*.tar.gz

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