def test_invalid_scalar_index(adata, index):
    # https://github.com/theislab/anndata/issues/619
    with pytest.raises(IndexError, match=r".*index.* out of range\."):
        _ = adata[index]
def test_cannot_write_empty_identifier(self):
        with self.assertRaises(ValueError):
            _ = cypher_escape("")