'Remove a non existing conn, nothing should happen.'

def test_remove_conn(self):

    self.assertEqual(self.cm.get_connections_total(), 0)
    conn = self.cm.get_available_connection(self.request, (lambda h: Mock()))
    self.assertEqual(self.cm.get_connections_total(), 0)
    non_exist_host = 'non_host'
    self.cm.remove_connection(conn, non_exist_host)
    self.cm.remove_connection(conn, self.request)
    self.assertEqual(self.cm.get_connections_total(), 0)
