def test_generate_thankyou_letter():
donor = Donor('Zhen', 'Yang', 230)
donor.add_donation_amount(100)
my_str = donor.generate_thankyou_letter().strip()
assert my_str.startswith('Dear')
assert my_str.endswith('Zhen')
assert 'Yang' in my_str # test last name
assert '100' in my_str # test total donation
def send_thankyou_text():
while True:
d_name = input(donor_name_prompt).strip()
valid_name = valid_input(d_name, 2) # validate the donor name
if valid_name != -1: # valid donor name
amount = input(donoation_amount_prompt).strip()
valid_amount = valid_input(amount, 3) # validate the donation
while valid_amount == -1: # invalid donation amount
amount = input(donoation_amount_prompt).strip()
valid_amount = valid_input(amount, 3)
# get a new donor object
donor = Donor(valid_name[0], valid_name[1], valid_amount)
# update the donor database
donor = donors_db.update_donors_db(donor)
# print the thank you letter for current donor
print(donor.generate_thankyou_letter())
break