add tests for fieldsets, fields and required fields #745

	name: zpretty
	on: [push]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: [3.8]

	steps:
	# git checkout
	- uses: actions/checkout@v2

	# python setup
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v1
	with:
	python-version: ${{ matrix.python-version }}

	# python cache
	- uses: actions/cache@v1
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
	restore-keys: \|
	${{ runner.os }}-pip-

	# install zpretty
	- name: install zpretty
	run: pip install zpretty

	# run zpretty
	- name: run zpretty
	run: find src -name '*.zcml' \| xargs zpretty -i

	# XXX: this doesn't work on gh actions (https://github.com/plone/plone.restapi/pull/1119/checks?check_run_id=2686474411)
	# run git diff
	- name: run git diff
	run: git diff --exit-code

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