'Test `close` call for non-urllib3-like raw objects.
Should work when `release_conn` attr doesn\'t exist on `response.raw`.'

def test_response_without_release_conn(self):

    resp = requests.Response()
    resp.raw = StringIO.StringIO('test')
    assert (not resp.raw.closed)
    resp.close()
    assert resp.raw.closed
