Add fixtures for object store tests

Author: maxrjones

tests/test_store/test_object.py

@@ -1,7 +1,7 @@
 # ruff: noqa: E402
 import pytest
 
-pytest.importorskip("obstore")
+obstore = pytest.importorskip("obstore")
 
 from zarr.core.buffer import cpu
 from zarr.storage.object_store import ObjectStore
@@ -10,3 +10,13 @@
 
 class TestObjectStore(StoreTests[ObjectStore, cpu.Buffer]):
     store_cls = ObjectStore
+    buffer_cls = cpu.Buffer
+
+    @pytest.fixture
+    def store_kwargs(self, tmpdir) -> dict[str, str | bool]:
+        store = obstore.store.LocalStore(prefix=tmpdir)
+        return {"store": store, "read_only": False}
+
+    @pytest.fixture
+    def store(self, store_kwargs: dict[str, str | bool]) -> ObjectStore:
+        return self.store_cls(**store_kwargs)