def test_clean_notebooks_for_numbers(self):
        temp = get_temp_folder(__file__, "temp_clean_notebooks_for_numbers")
        nb = os.path.join(temp, "..", "data", "notebook_with_svg.ipynb")
        fold = os.path.join(temp, '_doc', 'notebooks')
        self.assertNotExists(fold)
        os.makedirs(fold)
        shutil.copy(nb, fold)
        res = clean_notebooks_for_numbers(temp)
        self.assertEqual(len(res), 1)
        with open(res[0], 'r') as f:
            content = f.read()
        self.assertIn('"execution_count": 1,', content)