test(ci): add test environment for oldest supported dependency versions

Author: jhamman

.github/workflows/test.yml

@@ -70,3 +70,30 @@ jobs:
     - name: Run Tests
       run: |
         hatch env run --env upstream run
+
+  min_deps:
+    name: py=${{ matrix.python-version }}-min_deps
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.11']
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: 'pip'
+    - name: Install Hatch
+      run: |
+        python -m pip install --upgrade pip 
+        pip install hatch
+    - name: Set Up Hatch Env
+      run: |
+        hatch env create min_deps
+        hatch env run -e min_deps list-env
+    - name: Run Tests
+      run: |
+        hatch env run --env min_deps run

pyproject.toml

@@ -28,12 +28,13 @@ requires-python = ">=3.11"
 dependencies = [
     'asciitree',
     'numpy>=1.25',
-    'numcodecs>=0.10.2',
-    'fsspec>2024',
-    'crc32c',
-    'typing_extensions',
-    'donfig',
+    'numcodecs>=0.13',
+    'fsspec>=2022.10.0',
+    'crc32c>=2.3',
+    'typing_extensions>=4.6',
+    'donfig>=0.8',
 ]
+
 dynamic = [
   "version",
 ]
@@ -98,7 +99,7 @@ extra = [
 ]
 optional = [
     'lmdb',
-    'universal-pathlib',
+    'universal-pathlib>=0.0.22',
 ]
 
 [project.urls]
@@ -184,6 +185,7 @@ build = "cd docs && make html"
 serve = "sphinx-autobuild docs docs/_build --host 0.0.0.0"
 
 [tool.hatch.envs.upstream]
+python = "3.13"
 dependencies = [
     'numpy',  # from scientific-python-nightly-wheels
     'numcodecs @ git+https://github.com/zarr-developers/numcodecs',
@@ -212,6 +214,35 @@ run-mypy = "mypy src"
 run-hypothesis = "pytest --hypothesis-profile ci tests/test_properties.py tests/test_store/test_stateful*"
 list-env = "pip list"
 
+[tool.hatch.envs.min_deps]
+description = """Test environment for minimum supported dependencies
+
+See Spec 0000 for details and drop schedule: https://scientific-python.org/specs/spec-0000/
+"""
+python = "3.11"
+dependencies = [
+    'numpy==1.25.*',
+    'numcodecs==0.13.*',  # 0.13 needed for? (should be 0.11)
+    'fsspec==2022.10.0',
+    's3fs==2022.10.0',
+    'universal_pathlib==0.0.22',
+    'crc32c==2.3.*',
+    'typing_extensions==4.6.*',  # 4.5 needed for @deprecated, 4.6 for Buffer
+    'donfig==0.8.*',
+    # test deps
+    'hypothesis',
+    'pytest',
+    'pytest-cov',
+    'pytest-asyncio',
+    'moto[s3]',
+]
+
+[tool.hatch.envs.min_deps.scripts]
+run = "pytest --verbose"
+run-hypothesis = "pytest --hypothesis-profile ci tests/test_properties.py tests/test_store/test_stateful*"
+list-env = "pip list"
+
+
 [tool.ruff]
 line-length = 100
 force-exclude = true

src/zarr/storage/remote.py

@@ -2,8 +2,6 @@
 
 from typing import TYPE_CHECKING, Any, Self
 
-import fsspec
-
 from zarr.abc.store import ByteRangeRequest, Store
 from zarr.storage.common import _dereference_path
 
@@ -130,7 +128,13 @@ def from_url(
         -------
         RemoteStore
         """
-        fs, path = fsspec.url_to_fs(url, **storage_options)
+        try:
+            from fsspec import url_to_fs
+        except ImportError:
+            # before fsspec==2024.3.1
+            from fsspec.core import url_to_fs
+
+        fs, path = url_to_fs(url, **storage_options)
         return cls(fs=fs, path=path, mode=mode, allowed_exceptions=allowed_exceptions)
 
     async def clear(self) -> None: