def METHOD_NAME(self):
    fourtheta = FourTheta(
        model_mode=ModelMode.MULTIPLICATIVE,
        trend_mode=TrendMode.EXPONENTIAL,
        season_mode=SeasonalityMode.ADDITIVE,
        seasonality_period=None,
        normalization=False,
    )
    theta = Theta(
        season_mode=SeasonalityMode.ADDITIVE,
        seasonality_period=None,
    )
    assert fourtheta.min_train_series_length == 3
    assert theta.min_train_series_length == 3