def METHOD_NAME(self, cognite_client, test_time_series):
    from sympy import symbols
    dps1 = cognite_client.time_series.data.synthetic.query(
        expressions=symbols("a"),
        start=datetime(2017, 1, 1),
        end="now",
        limit=100,
        variables={"a": test_time_series[0].external_id},
    )
    dps2 = cognite_client.time_series.data.synthetic.query(
        expressions=[symbols("a"), symbols("b")],
        start=datetime(2017, 1, 1),
        end="now",
        limit=100,
        variables={"a": test_time_series[0], "b": test_time_series[0].external_id},
    )
    assert 100 == len(dps1)
    assert 100 == len(dps2[0])
    assert dps1 == dps2[0]
    assert isinstance(dps1, Datapoints)
    assert isinstance(dps2, DatapointsList)