import unittest

​

class TestPasswordGenerator(unittest.TestCase):

    def test_length(self):

        password = generate_custom_password(12)

        self.assertEqual(len(password), 12)

​

    def test_character_types(self):

        password = generate_custom_password(12, uppercase=True, lowercase=False, digits=False, special=False)

        self.assertTrue(all(c in string.ascii_uppercase for c in password))

​

    def test_no_characters_selected(self):

        with self.assertRaises(ValueError):

            generate_custom_password(12, uppercase=False, lowercase=False, digits=False, special=False)

​

if __name__ == "__main__":

    unittest.main()

​

​