Use -platfrom offscreen to prevent Qt errors #139

	---
	# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
	name: Tests

	on:
	push:
	branches: ['main']
	pull_request:
	branches: ['main']
	workflow_dispatch:

	env:
	# https://github.com/musescore/MuseScore/issues/17247
	# https://github.com/musescore/MuseScore/issues/17247#issuecomment-1510434918
	# https://ourcodeworld.com/articles/read/1409/how-to-use-musescore-3-in-headless-mode-in-ubuntu-2004
	QT_QPA_PLATFORM: offscreen


	jobs:
	tests:
	name: Python ${{ matrix.python-version }}
	runs-on: ubuntu-latest

	strategy:
	matrix:
	python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']

	steps:
	- name: >-
	Install “libfuse2” to prevent AppImage Error: error
	while loading shared libraries: libfuse.so.2: cannot open shared
	object file: No such file or directory
	run: sudo apt install libfuse2
	- name: Download latest “mscore” AppImage
	run: \|
	wget --quiet --output-document mscore https://github.com/musescore/MuseScore/releases/download/v4.2.0/MuseScore-4.2.0.233521125-x86_64.AppImage
	chmod a+x mscore
	sudo cp mscore /usr/bin/mscore

	# https://github.com/marketplace/actions/checkout
	- uses: actions/checkout@v3
	# https://github.com/marketplace/actions/setup-python
	- uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip setuptools wheel virtualenv tox tox-gh-actions

	# https://github.com/ymyzk/tox-gh-actions
	- name: Run tox targets for ${{ matrix.python-version }}
	run: python -m tox

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