import example
import unittest
 
class TestExampleFunction_TestCase(unittest.TestCase):
    def test_times_two(self):
        self.assertEqual(example.times_two(2), 4)
 
 
class TestExampleFunction:
    def test_times_two(self):
        assert example.times_two(2) == 4
 
 
def test_times_two():
    assert example.times_two(2) == 4