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

import unittest


# %% Example 3: 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:
        """
        Hook method for setting up the test fixture before exercising it.
        This method is called before calling the implemented test methods.
        """
        print("\n----setup if any\n")

    def testCalculation(self) -> None:
        self.assertEqual(fib(0), 0)
        self.assertEqual(fib(1), 1)
        self.assertEqual(fib(5), 5)
        self.assertEqual(fib(10), 55)
        self.assertEqual(fib(20), 6765)

    def tearDown(self) -> None:
        """
        Hook method for deconstructing the class fixture
        after running all tests in the class.
        """
        print("\n----teardown if any\n")


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