### Question:
ApacheCommonsDeckOfCardsAsList { public MultiValuedMap<Suit, Card> getCardsBySuit() { return this.cardsBySuit; } ApacheCommonsDeckOfCardsAsList(); Deque<Card> shuffle(Random random); Set<Card> deal(Deque<Card> deque, int count); List<Set<Card>> shuffleAndDeal(Random random, int hands, int cardsPerHand); List<Set<Card>> dealHands(Deque<Card> shuffled, int hands, int cardsPerHand); List<Card> diamonds(); List<Card> hearts(); List<Card> spades(); List<Card> clubs(); Bag<Suit> countsBySuit(); MultiSet<Rank> countsByRank(); List<Card> getCards(); MultiValuedMap<Suit, Card> getCardsBySuit();  }### Answer:
@Test public void cardsBySuit() { var jdkCardsBySuit = this.jdkDeck.getCardsBySuit(); var acCardsBySuit = this.acDeck.getCardsBySuit(); Assert.assertEquals(jdkCardsBySuit.get(Suit.CLUBS), new ArrayList<>(acCardsBySuit.get(Suit.CLUBS))); }
@Test public void cardsBySuitIsImmutable() { var acCardsBySuit = this.acDeck.getCardsBySuit(); Verify.assertThrows( UnsupportedOperationException.class, () -> acCardsBySuit.remove(Suit.CLUBS)); Verify.assertThrows( UnsupportedOperationException.class, acCardsBySuit::clear); Verify.assertThrows( UnsupportedOperationException.class, () -> acCardsBySuit.get(Suit.CLUBS).remove(0)); Verify.assertThrows( UnsupportedOperationException.class, () -> acCardsBySuit.get(Suit.CLUBS).add(null)); Verify.assertThrows( UnsupportedOperationException.class, acCardsBySuit.get(Suit.CLUBS)::clear); }