update tests

Author: benbovy

xarray/tests/test_dataarray.py

@@ -1522,6 +1522,12 @@ def test_coords(self) -> None:
             self.mda["level_1"] = ("x", np.arange(4))
             self.mda.coords["level_1"] = ("x", np.arange(4))
 
+    def test_coords_dims(self) -> None:
+        da = DataArray(
+            [[1.0, 2.0], [3.0, 4.0]], coords={"a": ("x", [0, 1])}, dims=("x", "y")
+        )
+        assert da.coords.dims == ("x",)
+
     def test_coords_to_index(self) -> None:
         da = DataArray(np.zeros((2, 3)), [("x", [1, 2]), ("y", list("abc"))])
 

xarray/tests/test_dataset.py

@@ -892,6 +892,11 @@ def test_coords_properties(self) -> None:
             "b": np.dtype("int64"),
         }
 
+    def test_coords_dims(self) -> None:
+        # https://github.com/pydata/xarray/issues/9466
+        ds_no_coord = Dataset(data_vars={"a": ("x", [0, 1])})
+        assert not len(ds_no_coord.coords.dims)
+
     def test_coords_modify(self) -> None:
         data = Dataset(
             {

xarray/tests/test_datatree.py

@@ -666,6 +666,18 @@ def test_properties(self) -> None:
             "b": np.dtype("int64"),
         }
 
+    def test_dims(self) -> None:
+        # https://github.com/pydata/xarray/issues/9466
+        ds = Dataset(
+            data_vars={
+                "foo": (["x", "y"], np.random.randn(2, 3)),
+            },
+        )
+        dt = DataTree(dataset=ds)
+        dt["child"] = DataTree()
+
+        assert not len(dt.coords.dims)
+
     def test_modify(self) -> None:
         ds = Dataset(
             data_vars={