def setUp(self):

self.calc = Calculator()

def test_add(self):

result = self.calc.add(5, 3)

self.assertEqual(result, 8)

def test_subtract(self):

result = self.calc.subtract(10, 4)

self.assertEqual(result, 6)

def multiply_test(self):

result = self.calc.multiply(9, 2)

self.assertEqual(result, 18)

def test_divide(self):

result = self.calc.divide(6, 3)

self.assertEqual(result, 2)

with self.assertRaises(ZeroDivisionError):

self.calc.divide(10, 0)