chore(deps): make fsspec and upath optional dependencies

pyproject.toml

@@ -28,8 +28,7 @@ requires-python = ">=3.11"
 dependencies = [
     'numpy>=1.25',
     'numcodecs[crc32c]>=0.14',
-    'fsspec>=2022.10.0',
-    'typing_extensions>=4.6',
+    'typing_extensions>=4.9',
     'donfig>=0.8',
 ]
 
@@ -54,16 +53,16 @@ license = {text = "MIT License"}
 keywords = ["Python", "compressed", "ndimensional-arrays", "zarr"]
 
 [project.optional-dependencies]
+fsspec = [
+    "fsspec>=2023.10.0",
+]
 test = [
     "coverage",
     "pytest",
     "pytest-cov",
-    "msgpack",
     "s3fs",
     "pytest-asyncio",
     "moto[s3]",
-    "flask-cors",
-    "flask",
     "requests",
     "mypy",
     "hypothesis",

tests/test_store/test_core.py

@@ -3,7 +3,6 @@
 
 import pytest
 from _pytest.compat import LEGACY_PATH
-from upath import UPath
 
 from zarr.core.common import AccessModeLiteral
 from zarr.storage._utils import normalize_path
@@ -72,6 +71,7 @@ async def test_make_store_path_invalid() -> None:
 
 
 async def test_make_store_path_fsspec(monkeypatch) -> None:
+    pytest.importorskip("fsspec")
     store_path = await make_store_path("http://foo.com/bar")
     assert isinstance(store_path.store, RemoteStore)
 
@@ -106,13 +106,17 @@ async def test_unsupported() -> None:
         "foo/bar///",
         Path("foo/bar"),
         b"foo/bar",
-        UPath("foo/bar"),
     ],
 )
-def test_normalize_path_valid(path: str | bytes | Path | UPath) -> None:
+def test_normalize_path_valid(path: str | bytes | Path) -> None:
     assert normalize_path(path) == "foo/bar"
 
 
+def test_normalize_path_upath() -> None:
+    upath = pytest.importorskip("upath")
+    assert normalize_path(upath.UPath("foo/bar")) == "foo/bar"
+
+
 def test_normalize_path_none():
     assert normalize_path(None) == ""
 

tests/test_store/test_remote.py

@@ -4,10 +4,8 @@
 import os
 from typing import TYPE_CHECKING
 
-import fsspec
 import pytest
 from botocore.session import Session
-from upath import UPath
 
 import zarr.api.asynchronous
 from zarr.core.buffer import Buffer, cpu, default_buffer_prototype
@@ -21,6 +19,7 @@
     import botocore.client
 
 
+fsspec = pytest.importorskip("fsspec")
 s3fs = pytest.importorskip("s3fs")
 requests = pytest.importorskip("requests")
 moto_server = pytest.importorskip("moto.moto_server.threaded_moto_server")
@@ -182,7 +181,8 @@ async def test_remote_store_from_uri(self, store: RemoteStore):
         assert dict(group.attrs) == {"key": "value-3"}
 
     def test_from_upath(self) -> None:
-        path = UPath(
+        upath = pytest.importorskip("upath")
+        path = upath.UPath(
             f"s3://{test_bucket_name}/foo/bar/",
             endpoint_url=endpoint_url,
             anon=False,