def test_dispatch_scale_type_on_creation(data):
scale = parameters.Scale("amount_scale", data, "")
first_jan = periods.Instant((2017, 11, 1))
result = scale.get_at_instant(first_jan)
assert isinstance(result, taxscales.SingleAmountTaxScale)
def test_assign_amounts_on_creation(data):
scale = parameters.Scale("amount_scale", data, "")
first_jan = periods.Instant((2017, 11, 1))
scale_at_instant = scale.get_at_instant(first_jan)
result = scale_at_instant.amounts
assert result == [6]