import unittest
import numpy as np
import user_code  

def _dynamic(tc, ok, ok_msg, fail_msg):
    tc._testMethodName = ok_msg if ok else fail_msg
    (tc.assertTrue if ok else tc.fail)(tc._testMethodName)

class TestCompoundInterest(unittest.TestCase):

    def test_total_and_interest(self):
        
        P = getattr(user_code, "P", None)
        r = getattr(user_code, "r", None)
        n = getattr(user_code, "n", None)
        t = getattr(user_code, "t", None)

        A_expected = P * (1 + r/n) ** (n*t)
        interest_expected = A_expected - P

        A = getattr(user_code, "A", None)
        interest = getattr(user_code, "interest_earned", None)

        reasons = []
        if A is None or not np.isclose(A, A_expected, rtol=1e-6):
            reasons.append(f"A mismatch; expectedâ{A_expected:.2f}, got {A}")
        if interest is None or not np.isclose(interest, interest_expected, rtol=1e-6):
            reasons.append(f"interest mismatch; expectedâ{interest_expected:.2f}, got {interest}")

        _dynamic(self, not reasons,
                 "PASS: A and interest_earned are correct",
                 "FAIL: " + "; ".join(reasons))

    def test_amounts_growth(self):
        P = user_code.P
        r = user_code.r
        n = user_code.n
        t = user_code.t

        years = np.linspace(0, t, t * n + 1)
        amounts_expected = P * (1 + r/n) ** (n * years)

        amounts = getattr(user_code, "amounts", None)

        ok = amounts is not None and np.allclose(amounts, amounts_expected, rtol=1e-6)
        _dynamic(self, ok,
                 "PASS: amounts growth over time is correct",
                 "FAIL: amounts array is incorrect or missing")


test_code.py

This course distills the essentials of Python's math module, focusing on trigonometric functions, logarithmic operations, and mathematical constants. Learners will gain hands-on experience using Python to perform these standard mathematical computations, ideal for beginners seeking practical skills with the math module.

Challenge: Predicting Savings Growth

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