backport fix to 3.x branch #197

	name: tests

	on:
	push:
	branches: [ master ]
	pull_request:
	# Allow to run this workflow manually from the Actions tab
	workflow_dispatch:
	jobs:
	build:
	strategy:
	fail-fast: false
	matrix:
	config:
	# [Python version, tox env]
	- ["2.7", "plone52-py27"]
	- ["3.7", "plone52-py37"]
	- ["3.8", "plone52-py38"]
	runs-on: ubuntu-20.04
	name: ${{ matrix.config[1] }}
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.config[0] }}
	- name: Pip cache
	uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ matrix.config[0] }}-${{ hashFiles('setup.*', 'tox.ini') }}
	restore-keys: \|
	${{ runner.os }}-pip-${{ matrix.config[0] }}-
	${{ runner.os }}-pip-
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install tox
	- name: Test
	run: tox -e ${{ matrix.config[1] }}

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