def METHOD_NAME(self, cognite_client, test_time_series, post_spy):
    query = f"ts{{id:{test_time_series[0].id}}} + ts{{id:{test_time_series[1].id}}}"
    dps = cognite_client.time_series.data.synthetic.query(
        expressions=query, start=datetime(1920, 1, 1, tzinfo=timezone.utc), end="now", limit=23456
    )
    assert 23456 == len(dps)
    assert 3 == cognite_client.time_series.data.synthetic._post.call_count