is_even.py

import unittest

def is_even(number):
    ''' Returns True if **number** is even or False if it is odd. '''
    return number % 2


class TestUM(unittest.TestCase):
    def test_is_boolean(self):
    
        self.assertIsInstance(is_even(1), bool)

    def test_return_true(self):
        self.assertEqual(True, is_even(4))

    def test_return_false(self):
        self.assertEqual(False, is_even(5))

    def test_even_zero(self):
        self.assertTrue(is_even(0))

    def test_even_negative(self):
        self.assertTrue(is_even(-2))

    def test_even_positive(self):
        self.assertTrue(is_even(2))

    def test_odd_positive(self):
        self.assertFalse(is_even(3))

    def test_odd_negative(self):
        self.assertFalse(is_even(-3))

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