def METHOD_NAME():
    pivot_df = pp.pivot(
        df=single_metric_df,
        index=["dttm"],
        columns=["country"],
        aggregates={"sum_metric": {"operator": "sum"}},
    )
    rolling_df = pp.rolling(
        df=pivot_df,
        rolling_type="sum",
        window=2,
        min_periods=2,
        columns={"sum_metric": "sum_metric"},
    )
    assert rolling_df.empty is True