Better test for bisection #319

	name: code-style
	on: [push, pull_request]
	jobs:
	black:
	name: black [format]
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	- name: Setup Python
	uses: actions/setup-python@v2
	with:
	python-version: "3.8"
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install black
	- name: Check code formatting
	run: black --check .

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