'test_get
CouchBackend.get should return  and take two params
db conn to couchdb is mocked.
TODO Should test on key not exists'

def test_get(self):

    x = CouchBackend(app=self.app)
    x._connection = Mock()
    get = x._connection.get = MagicMock()
    assert (x.get(u'1f3fab') == get.return_value[u'value'])
    x._connection.get.assert_called_once_with(u'1f3fab')
