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Tests

Clarify git-sim default behavior in README #6

	name: Tests

	on:
	push:
	pull_request:
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	unit:
	name: ${{ matrix.os }}, Python ${{ matrix.python }}
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
	# skia-python publishes no 3.15 wheels yet, so 3.15 runs report
	# whether the install works there without failing the others
	continue-on-error: ${{ matrix.python == '3.15' }}
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python }}
	allow-prereleases: true
	- name: Install the libraries skia needs on Linux
	if: runner.os == 'Linux'
	run: sudo apt-get update && sudo apt-get install -y libegl1 libgl1 libfontconfig1
	- name: Install
	run: python -m pip install ".[dev]"
	- name: Set a Git identity for the test repos
	run: \|
	git config --global user.name "git-sim tests"
	git config --global user.email "tests@example.com"
	git config --global init.defaultBranch main
	- name: Unit tests
	run: python -m pytest tests/unit_tests -q
	- name: Draw a simulation
	shell: bash
	run: \|
	git init -q demo && cd demo
	echo a > a && git add a && git commit -qm First
	echo b > b && git add b && git commit -qm Second
	git-sim -d --media-dir ../media log
	ls -R ../media