def test_should_not_perform_mutation_on_options_when_normalize_options_is_called(self, normalize_message):
normalize_message.return_value = 'normalized message'
options_with_message = self.MockedOptions()
options_with_message.message = 'some message'
actual_options = normalize_options(options_with_message)
normalize_message.assert_called_with('some message')
self.assertTrue(actual_options is not options_with_message,
'performed mutation on the options instead of creating a new object')
def test_should_execute_normalize_message_when_message_option_is_given(self, normalize_message):
normalize_message.return_value = 'normalized message'
options_with_message = self.MockedOptions()
options_with_message.message = 'some message'
actual_options = normalize_options(options_with_message)
normalize_message.assert_called_with('some message')
self.assertEqual(actual_options.message, 'normalized message')
