def test_a_deal_can_return_the_teammate_of_a_player(self) -> None:
players = [Player(name="1"), Player(name="2"), Player(name="3"), Player(name="4")]
deal = Deal(players=players, bidder_index=0)
self.assertEqual(2, deal.get_teammate_index(Player(name="1")))
self.assertEqual(3, deal.get_teammate_index(Player(name="2")))
self.assertEqual(0, deal.get_teammate_index(Player(name="3")))
self.assertEqual(1, deal.get_teammate_index(Player(name="4")))
