import unittest  class TestStringMethods(unittest.TestCase):      def test_upper(self):         self.assertEqual('foo'.upper(), 'FOO')      def test_isupper(self):         self.assertTrue('FOO'.isupper())         self.assertFalse('Foo'.isupper())      def test_split(self):         s = 'hello world'         self.assertEqual(s.split(), ['hello', 'world'])         # check that s.split fails when the separator is not a string         with self.assertRaises(TypeError):             s.split(2)  if __name__ == '__main__':     unittest.main()

Read more of this post