Writing Mock Test for logging info to file

stringcalculator-test.py

import unittest
from unittest.mock import patch
from stringcalculator import add

class TestStringCalculator(unittest.TestCase):

  def test_add_empty_string_return_zero(self):
    self.assertEqual(add(''), 0)
    
  def test_add_one_number_will_return_itself(self):
    self.assertEqual(add('2'), 2)
    self.assertEqual(add('24'), 24)
    
  def test_add_two_numbers_separated_by_comma(self):
    self.assertEqual(add('1,2'),3)
    self.assertEqual(add('21,9'),30)
    
  @patch('stringcalculator.logging')
  def test_add_result_logs_info(self, mock_logging):
    add('1,2')
    self.assertTrue(mock_logging.info.called)