#!/usr/bin/python3
# -*- coding: utf-8 -*-

import unittest


# %% A more effficient example of fib
def fib(n: int) -> int:
    """
    Calculates the n-th Fibonacci number iteratively
    Notice the multi-line setup:
    """
    a, b = 0, 1
    for i in range(n):
        a, b = b, a + b
    # If you want to debug these with a debugger,
    # Just set a breakpoint within the function you want to test.
    return a


class FibonacciTest(unittest.TestCase):
    def setUp(self) -> None:
        self.fib_elems = ((0, 0), (1, 1), (2, 1), (3, 2), (4, 3), (5, 5))
        print("\n----setUp executed!")

    def testCalculation(self) -> None:
        for (i, val) in self.fib_elems:
            self.assertEqual(fib(i), val)

    def tearDown(self) -> None:
        del self.fib_elems
        print("\n----tearDown executed!")


if __name__ == "__main__":
    unittest.main(verbosity=2)