+  * ``python-requests-mock``

+ import os

+ import requests_mock

+ import requests

+ class TestDownloadFileError(unittest.TestCase):

+     """Check error status code and text in download_file."""

+     filename = '/tmp/tmp-download'

+ 

+     @requests_mock.Mocker()

+     def test_handle_download_file_error_404(self, m):

+         m.get("http://url", text='Not Found\n', status_code=404)

+         with self.assertRaises(requests.HTTPError):

+             download_file("http://url", self.filename)

+         try:

+             self.assertFalse(os.path.exists(self.filename))

+         except AssertionError:

+             os.unlink(self.filename)

+             raise

+ 

+     @requests_mock.Mocker()

+     def test_handle_download_file_error_500(self, m):

+         m.get("http://url", text='Internal Server Error\n', status_code=500)

+         with self.assertRaises(requests.HTTPError):

+             download_file("http://url", self.filename)

+         try:

+             self.assertFalse(os.path.exists(self.filename))

+         except AssertionError:

+             os.unlink(self.filename)

+             raise

+