def it_calculates_season_changes():
cov = Covenant()
folk = Covenfolk("george", "magi")
cov.covenfolken.add_covenfolk(folk)
assert cov.calculate_expenditures() == 5.5
cov.change_season("autumn")
assert cov.calculate_expenditures() == 11.0
def it_can_change_seasons():
cov = Covenant()
cov.change_season("autumn")
assert cov.season == "autumn"