def test_update_after_use():
"""
Test of improper update after Growfactors object has been used.
"""
gfo = Growfactors()
gfo.price_inflation_rates(gfo.first_year, gfo.last_year)
with pytest.raises(ValueError):
gfo.update('AWAGE', 2013, 0.01)
def test_update_after_use():
gf = Growfactors()
pir = gf.price_inflation_rates(gf.first_year, gf.last_year)
with pytest.raises(ValueError):
gf.update('AWAGE', 2013, 0.01)