TESTING & DEBUGGING

import unittest

def multiply(a, b):
    return a * b

class TestMathOperations(unittest.TestCase):
    def test_multiply(self):
        self.assertEqual(multiply(2, 3), 6)
        self.assertEqual(multiply(-1, 5), -5)
        self.assertEqual(multiply(0, 10), 0)

if __name__ == "__main__":
    # unittest.main() # Uncomment to run
    print("Tests defined.")