def test_nper(self):
"""
Test nper using values from excel conversions spreadsheet.
"""
# 12% is 1% per month (0.01)
test_data = [
({"rate": 0.01, "pmt": -200, "pv": 10000}, 69.6607168936),
({"rate": 0.01, "pmt": -300, "pv": 10000}, 40.7489071561),
({"rate": 0.01, "pmt": -500, "pv": 10000}, 22.425741878),
({"rate": 0.01, "pmt": -10100, "pv": 10000}, 1.0),
]
for (params, desired) in test_data:
actual = nper(**params)
self.assertAlmostEqual(actual, desired)
def calculate_current_loan_estimated_remaining_term(self):
if self.current_loan_balance and self.current_loan_monthly_payment and self.current_loan_rate:
rate = self.current_loan_rate / 12.0
pmt = -self.current_loan_monthly_payment
pv = self.current_loan_balance
self.current_loan_estimated_remaining_term = int(round(nper(rate, pmt, pv)))