Running unit tests fails with the following traceback:

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Failed 1 tests - output below:
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novaclient.tests.unit.test_client.ClientTest.test_client_with_timeout
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Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "novaclient/tests/unit/test_client.py", line 60, in test_client_with_timeout
        instance.authenticate()
      File "novaclient/client.py", line 612, in authenticate
        auth_url = self._v1_auth(auth_url)
      File "novaclient/client.py", line 648, in _v1_auth
        resp, body = self._time_request(url, 'GET', headers=headers)
      File "novaclient/client.py", line 431, in _time_request
        resp, body = self.request(url, method, **kwargs)
      File "novaclient/client.py", line 404, in request
        if resp.text:
      File "/home/migi/Desktop/Development/Downstream/python-novaclient/.tox/py27/lib/python2.7/site-packages/requests/models.py", line 796, in text
        if not self.content:
      File "/home/migi/Desktop/Development/Downstream/python-novaclient/.tox/py27/lib/python2.7/site-packages/requests/models.py", line 772, in content
        self._content = bytes().join(self.iter_content(CONTENT_CHUNK_SIZE)) or bytes()
      File "/home/migi/Desktop/Development/Downstream/python-novaclient/.tox/py27/lib/python2.7/site-packages/requests/models.py", line 705, in generate
        chunk = self.raw.read(chunk_size)
    AttributeError: 'NoneType' object has no attribute 'read'