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from datetime import datetime, timezone

import pandas as pd

from superset.utils.excel import df_to_excel


def test_timezone_conversion() -> None:
    """
    Test that columns with timezones are converted to a string.
    """
    df = pd.DataFrame({"dt": [datetime(2023, 1, 1, 0, 0, tzinfo=timezone.utc)]})
    contents = df_to_excel(df)
    assert pd.read_excel(contents)["dt"][0] == "2023-01-01 00:00:00+00:00"