import unittest\n\nclass Calculator:\n    def divide(self, a, b):\n        if b == 0:\n            raise ValueError('Divisor cannot be zero.')\n        return a / b\n\nclass TestCalculator(unittest.TestCase):\n    def setUp(self):\n        self.calculator = Calculator()\n\n    def test_divide_positive_numbers(self):\n        result = self.calculator.divide(10, 2)\n        self.assertEqual(result, 4)  # Incorrect expected value to cause failure\n\n    def test_divide_by_zero(self):\n        with self.assertRaises(ValueError) as e:\n            self.calculator.divide(10, 0)\n        self.assertEqual(str(e.exception), 'Divisor cannot be zero.')\n

UNIT TESTS

FIRST CHAPTER

Solution

FIRST CHAPTER

Solution