add old open_with_mode_r test

Author: d-v-b

tests/test_api.py

@@ -1,3 +1,4 @@
+import pathlib
 import warnings
 from typing import Literal
 
@@ -228,7 +229,7 @@ def test_save_errors() -> None:
     ["local", "memory", "remote", pytest.param("zip", marks=pytest.mark.xfail)],
     indirect=True,
 )
-def test_open_with_mode_r(store: Store) -> None:
+def test_open_store_with_mode_r(store: Store) -> None:
     # 'r' means read only (must exist)
     with pytest.raises(FileNotFoundError):
         zarr.open(store=store, mode="r")
@@ -244,6 +245,20 @@ def test_open_with_mode_r(store: Store) -> None:
         z2[:] = 3
 
 
+def test_open_path_with_mode_r(tmp_path: pathlib.Path) -> None:
+    # 'r' means read only (must exist)
+    with pytest.raises(FileNotFoundError):
+        zarr.open(store=tmp_path, mode="r")
+    z1 = zarr.ones(store=tmp_path, shape=(3, 3))
+    assert z1.fill_value == 1
+    z2 = zarr.open(store=tmp_path, mode="r")
+    assert isinstance(z2, Array)
+    assert z2.fill_value == 1
+    assert (z2[:] == 1).all()
+    with pytest.raises(ValueError):
+        z2[:] = 3
+
+
 @pytest.mark.parametrize(
     "store",
     ["local", "memory", "remote", "zip"],