How to use session in TestCase in Django?

I would like to read some session variables from a test (Django TestCase)

How to do that in a clean way ?

def test_add_docs(self):
    """
    Test add docs
    """
    # I would access to the session here:
    self.request.session['documents_to_share_ids'] = [1]

    response = self.client.get(reverse(self.document_add_view_id, args=[1]), follow=True)
    self.assertEquals(response.status_code, 200)