def test_validation_with_invalid_content_type_raise_exception(self):
        self.assertEqual(self.voiceover_application.content, '<p>Content</p>')
        self.voiceover_application.validate()

        self.voiceover_application.content = 1
        with self.assertRaisesRegex(
            utils.ValidationError, 'Expected content to be a string'
        ):
            self.voiceover_application.validate()