test + dep decorator

src/zarr/api/asynchronous.py

@@ -7,6 +7,7 @@
 
 import numpy as np
 import numpy.typing as npt
+from typing_extensions import deprecated
 
 from zarr.core.array import Array, AsyncArray, get_array_metadata
 from zarr.core.buffer import NDArrayLike
@@ -493,6 +494,7 @@ async def save_group(
     await asyncio.gather(*aws)
 
 
+@deprecated("Use AsyncGroup.tree instead.")
 async def tree(grp: AsyncGroup, expand: bool | None = None, level: int | None = None) -> Any:
     """Provide a rich display of the hierarchy.
 
@@ -514,11 +516,6 @@ async def tree(grp: AsyncGroup, expand: bool | None = None, level: int | None =
         `zarr.tree()` is deprecated and will be removed in a future release.
         Use `group.tree()` instead.
     """
-    warnings.warn(
-        "zarr.tree() is deprecated and will be removed in a future release. Use group.tree() instead.",
-        DeprecationWarning,
-        stacklevel=2,
-    )
     return await grp.tree(expand=expand, level=level)
 
 

src/zarr/api/synchronous.py

@@ -2,6 +2,8 @@
 
 from typing import TYPE_CHECKING, Any, Literal
 
+from typing_extensions import deprecated
+
 import zarr.api.asynchronous as async_api
 from zarr._compat import _deprecate_positional_args
 from zarr.core.array import Array, AsyncArray
@@ -155,6 +157,7 @@ def save_group(
     )
 
 
+@deprecated("Use Group.tree instead.")
 def tree(grp: Group, expand: bool | None = None, level: int | None = None) -> Any:
     return sync(async_api.tree(grp._async_group, expand=expand, level=level))
 

tests/test_api.py

@@ -300,9 +300,9 @@ def test_tree() -> None:
     g3.create_group("baz")
     g5 = g3.create_group("qux")
     g5.create_array("baz", shape=100, chunks=10)
-    # TODO: complete after tree has been reimplemented
-    # assert repr(zarr.tree(g1)) == repr(g1.tree())
-    # assert str(zarr.tree(g1)) == str(g1.tree())
+    with pytest.warns(DeprecationWarning):
+        assert repr(zarr.tree(g1)) == repr(g1.tree())
+        assert str(zarr.tree(g1)) == str(g1.tree())
 
 
 # @pytest.mark.parametrize("stores_from_path", [False, True])