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Support zarr v3 #28

	name: Test zarr backwards compatibility

	on:
	workflow_dispatch:
	pull_request:
	types: [synchronize, opened, reopened]
	branches:
	- main
	paths:
	- "src/spikeinterface/core/zarrextractors.py"
	- "src/spikeinterface/core/zarrrecordingextractor.py"
	- "src/spikeinterface/core/tests/test_zarr_backwards_compat.py"
	- ".github/workflows/test_zarr_compat.yml"
	- ".github/scripts/generate_zarr_v2_fixtures.py"

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	test-zarr-compat:
	name: zarr v2 -> v3 backwards compatibility
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.11"
	- uses: astral-sh/setup-uv@v7
	with:
	python-version: ${{ matrix.python-version }}
	enable-cache: true

	- name: Install SI 0.104.0 with zarr v2
	run: uv pip install --system "spikeinterface==0.104.0" "zarr<3"

	- name: Generate zarr v2 fixtures
	run: python .github/scripts/generate_zarr_v2_fixtures.py --output /tmp/zarr_v2_fixtures

	- name: Install current SI with zarr v3
	run: uv pip install --system -e . --group test-core

	- name: Check zarr version is v3
	run: python -c "import zarr; v = zarr.__version__; print(f'zarr {v}'); assert int(v.split('.')[0]) >= 3"

	- name: Run backward compatibility tests
	env:
	ZARR_V2_FIXTURES_PATH: /tmp/zarr_v2_fixtures
	run: pytest src/spikeinterface/core/tests/test_zarr_backwards_compat.py -v