import polars as pl
import requests_mock
from collectors.smard import fetch_smard_data

def test_fetch_smard_data():
    with requests_mock.Mocker() as m:
        # Mock index call
        m.get("https://www.smard.de/app/chart_data/4169/DE-LU/index_hour.json", 
              json={"timestamps": [1700000000000]})
        # Mock data call
        m.get("https://www.smard.de/app/chart_data/4169/DE-LU/4169_DE-LU_hour_1700000000000.json", 
              json={
                  "series": [[1700000000000, 50.0], [1700003600000, 60.0]]
              })
        
        df = fetch_smard_data(filter_id=4169)
        assert isinstance(df, pl.DataFrame)
        assert df.shape == (2, 2)
        assert "value" in df.columns
        assert df["value"][0] == 50.0