Unit test for the simple calculator functions.

simple_calc_test.py

import unittest
import simple_calc as sc


class SimpleCalcTest(unittest.TestCase):

    def test_add(self):
        result = sc.add(1, 2)
        self.assertEqual(result, 3)

    def test_subtract(self):
        result = sc.subtract(2, 1)
        self.assertEqual(result, 1)

    def test_multiply(self):
        result = sc.multiply(2, 2)
        self.assertEqual(result, 4)

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