def test_sub(self):
operation = Operation(4, 2)
result = operation.sub()
self.assertEqual(result, 2)
def test_assertion_2(self):
operation = Operation(3, 4)
self.assertIsInstance(operation, Operation)
def test_add(self):
"""test add method of Operation class"""
operation = Operation(3, 4)
result = operation.add()
self.assertEqual(result, 7)
def test_add_1(self):
operation = Operation(10, 3)
result = operation.add()
self.assertNotEqual(result, 12)
def test_add_1(self):
operation = Operation(4, 4)
result = operation.add()
self.assertEqual(result, 8)