Python standard library: unittest

import unittest

class U(unittest.TestCase):

      def setUp(self):
          self.x =  6
          self.y =  7
          self.z = 42

      def tearDown(self):
          print('The end.')

      def num_1(self):
          return self.z

      def num_2(self):
          return self.x * self.y

      def test_A(self):
          self.assertEqual(self.num_1(), self.num_2())

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