Unit test for function is_even()

test.py

import unittest


def is_even(number):
    return True

class TestCase(unittest.TestCase):
    def setUp(self):
        self.expected_output = [
            (2, True),
            (3, False),
            (4, True),
            (5, False)
        ]

    def test_is_even(self):
        real_res = []

        for arg, _ in self.expected_output:
            real_res.append((arg, is_even(arg)))

        msg_error = '\nFor %s Expected %s Got %s'
        msg = []
        for res1, res2 in zip(real_res, self.expected_output):
            if res1[1] != res2[1]:
                msg.append(msg_error % (res1[0], res1[1], res2[1]))

        self.assertEqual(real_res, self.expected_output, "".join(msg))


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