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_can_write_identifier_containing_back_ticks(self):
        escaped = cypher_escape("foo `bar`")
        assert escaped == "`foo ``bar```"