Test failing test_error_contains_path_of_offending_node

What happened?

Trying to package xarray 2024.11.0 in Mageia Caudron, I get this failure when running tests

Python 3.12
Numpy 2.1.0
Pandas 2.2.2

What did you expect to happen?

Test passes

Minimal Complete Verifiable Example

No response

MVCE confirmation

• Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
• Complete example — the example is self-contained, including all data and the text of any traceback.
• Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
• New issue — a search of GitHub Issues suggests this is not a duplicate.
• Recent environment — the issue occurs with the latest version of xarray and its dependencies.

Relevant log output

=================================== FAILURES ===================================
________ TestMapOverSubTree.test_error_contains_path_of_offending_node _________

self = <xarray.tests.test_datatree_mapping.TestMapOverSubTree object at 0x7f009b68f8c0>
create_test_datatree = <function create_test_datatree.<locals>._create_test_datatree at 0x7f008eb9dbc0>

    def test_error_contains_path_of_offending_node(self, create_test_datatree):
        dt = create_test_datatree()
        dt["set1"]["bad_var"] = 0
        print(dt)
    
        def fail_on_specific_node(ds):
            if "bad_var" in ds:
                raise ValueError("Failed because 'bar_var' present in dataset")
    
        with pytest.raises(
            ValueError,
            match=re.escape(
                r"Raised whilst mapping function over node with path 'set1'"
            ),
        ):
>           dt.map_over_datasets(fail_on_specific_node)

/builddir/build/BUILD/python-xarray-2024.11.0-build/xarray-2024.11.0/xarray/tests/test_datatree_mapping.py:175: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/builddir/build/BUILD/python-xarray-2024.11.0-build/xarray-2024.11.0/xarray/core/datatree.py:1462: in map_over_datasets
    return map_over_datasets(func, self, *args)
/builddir/build/BUILD/python-xarray-2024.11.0-build/xarray-2024.11.0/xarray/core/datatree_mapping.py:103: in map_over_datasets
    results = func_with_error_context(*node_dataset_args)
/builddir/build/BUILD/python-xarray-2024.11.0-build/xarray-2024.11.0/xarray/core/datatree_mapping.py:133: in wrapper
    return func(*args, **kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

ds = <xarray.DatasetView> Size: 24B
Dimensions:  ()
Data variables:
    a        int64 8B 0
    b        int64 8B 1
    bad_var  int64 8B 0

    def fail_on_specific_node(ds):
        if "bad_var" in ds:
>           raise ValueError("Failed because 'bar_var' present in dataset")
E           ValueError: Failed because 'bar_var' present in dataset
E           Raised whilst mapping function over node with path 'set1'

/builddir/build/BUILD/python-xarray-2024.11.0-build/xarray-2024.11.0/xarray/tests/test_datatree_mapping.py:167: ValueError

During handling of the above exception, another exception occurred:

self = <xarray.tests.test_datatree_mapping.TestMapOverSubTree object at 0x7f009b68f8c0>
create_test_datatree = <function create_test_datatree.<locals>._create_test_datatree at 0x7f008eb9dbc0>

    def test_error_contains_path_of_offending_node(self, create_test_datatree):
        dt = create_test_datatree()
        dt["set1"]["bad_var"] = 0
        print(dt)
    
        def fail_on_specific_node(ds):
            if "bad_var" in ds:
                raise ValueError("Failed because 'bar_var' present in dataset")
    
>       with pytest.raises(
            ValueError,
            match=re.escape(
                r"Raised whilst mapping function over node with path 'set1'"
            ),
        ):
E       AssertionError: Regex pattern did not match.
E        Regex: "Raised\\ whilst\\ mapping\\ function\\ over\\ node\\ with\\ path\\ 'set1'"
E        Input: "Failed because 'bar_var' present in dataset"

/builddir/build/BUILD/python-xarray-2024.11.0-build/xarray-2024.11.0/xarray/tests/test_datatree_mapping.py:169: AssertionError
----------------------------- Captured stdout call -----------------------------
<xarray.DataTree>
Group: /
│   Dimensions:  (y: 3, x: 2)
│   Dimensions without coordinates: y, x
│   Data variables:
│       a        (y) int64 24B 6 7 8
│       set0     (x) int64 16B 9 10
├── Group: /set1
│   │   Dimensions:  ()
│   │   Data variables:
│   │       a        int64 8B 0
│   │       b        int64 8B 1
│   │       bad_var  int64 8B 0
│   ├── Group: /set1/set1
│   └── Group: /set1/set2
├── Group: /set2
│   │   Dimensions:  (x: 2)
│   │   Dimensions without coordinates: x
│   │   Data variables:
│   │       a        (x) int64 16B 2 3
│   │       b        (x) float64 16B 0.1 0.2
│   └── Group: /set2/set1
└── Group: /set3

Anything else we need to know?

No response

Environment

Start with xarray/tests/test_datatree_mapping.py and the failing test_error_contains_path_of_offending_node test, then inspect xarray/core/datatree.py and xarray/core/datatree_mapping.py at the traceback locations. Run the named test and determine why the expected node-path context is absent from the raised error. Done means the test passes while preserving the reported error context.