import unittest

from main import is_adult


class TestIsAdult(unittest.TestCase):
    def test_min_age(self):
        self.assertEqual(True, is_adult(18))
        self.assertEqual(False, is_adult(17))

        self.assertEqual(False, is_adult(-1))

    def test_zero(self):
        self.assertEqual(False, is_adult(0))

    def test_string(self):
        self.assertEqual(False, is_adult("19"))  # type: ignore


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