Method test_to_and_from_empty_dataframe

xarray/tests/test_dataset.py:5484–5491

(self)

        assert_identical(ds_dense, ds_sparse)

    def test_to_and_from_empty_dataframe(self) -> None:
        # GH697
        expected = pd.DataFrame({"foo": []})
        ds = Dataset.from_dataframe(expected)
        assert len(ds["foo"]) == 0
        actual = ds.to_dataframe()
        assert len(actual) == 0
        assert expected.equals(actual)

    def test_from_dataframe_multiindex(self) -> None:
        index = pd.MultiIndex.from_product([["a", "b"], [1, 2, 3]], names=["x", "y"])