add regression tests

Author: TomNicholas

xarray/tests/test_coordinates.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import numpy as np
 import pandas as pd
 import pytest
 
@@ -8,7 +9,7 @@
 from xarray.core.dataarray import DataArray
 from xarray.core.dataset import Dataset
 from xarray.core.indexes import PandasIndex, PandasMultiIndex
-from xarray.core.variable import IndexVariable
+from xarray.core.variable import IndexVariable, Variable
 from xarray.tests import assert_identical, source_ndarray
 
 
@@ -69,6 +70,12 @@ def test_init_dim_sizes_conflict(self) -> None:
         with pytest.raises(ValueError):
             Coordinates(coords={"foo": ("x", [1, 2]), "bar": ("x", [1, 2, 3, 4])})
 
+    def test_init_var_shares_name_with_dim(self) -> None:
+        # regression test for GH #8883
+        var = Variable(data=np.arange(6).reshape(2, 3), dims=["x", "y"])
+        with pytest.raises(ValueError):
+            Coordinates(coords={"x": var}, indexes={})
+
     def test_from_pandas_multiindex(self) -> None:
         midx = pd.MultiIndex.from_product([["a", "b"], [1, 2]], names=("one", "two"))
         coords = Coordinates.from_pandas_multiindex(midx, "x")