Tweak, move `HallSymbol` to separate file #91

	name: tests

	# Controls when the workflow will run
	on: [push, pull_request, workflow_dispatch]

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	build:
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python-version: ['3.10']
	include:
	- os: ubuntu-20.04
	python-version: '3.6'
	runs-on: ${{ matrix.os }}
	name: Python ${{ matrix.python-version }} on ${{ matrix.os }} tests

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- name: Checkout
	uses: actions/checkout@v3

	- name: Setup Python
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install Python dependencies
	uses: py-actions/py-dependency-install@v3
	with:
	path: "requirements.txt"

	- name: Generate coverage report
	run: \|
	pip install coverage
	coverage run -m unittest

	- name: Upload coverage to Codecov
	uses: codecov/codecov-action@v3
	with:
	verbose: true

Provide feedback