Python/maths/least_common_multiple.py

import unittest


def find_lcm(first_num: int, second_num: int) -> int:
    """Find the least common multiple of two numbers.

       Learn more: https://en.wikipedia.org/wiki/Least_common_multiple

       >>> find_lcm(5,2)
       10
       >>> find_lcm(12,76)
       228
    """
    max_num = first_num if first_num >= second_num else second_num
    common_mult = max_num
    while (common_mult % first_num > 0) or (common_mult % second_num > 0):
        common_mult += max_num
    return common_mult


class TestLeastCommonMultiple(unittest.TestCase):

    test_inputs = [
        (10, 20),
        (13, 15),
        (4, 31),
        (10, 42),
        (43, 34),
        (5, 12),
        (12, 25),
        (10, 25),
        (6, 9),
    ]
    expected_results = [20, 195, 124, 210, 1462, 60, 300, 50, 18]

    def test_lcm_function(self):
        for i, (first_num, second_num) in enumerate(self.test_inputs):
            actual_result = find_lcm(first_num, second_num)
            with self.subTest(i=i):
                self.assertEqual(actual_result, self.expected_results[i])


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