### Question:
PlayerGames implements Iterable<PlayerGame>, Tickable { public void clear() { players().forEach(this::remove); } PlayerGames(); void onAdd(Consumer<PlayerGame> consumer); void onRemove(Consumer<PlayerGame> consumer); void init(ReadWriteLock lock); void removeCurrent(Player player); void remove(Player player); PlayerGame get(String id); PlayerGame get(GamePlayer player); PlayerGame add(Player player, String roomName, PlayerSave save); boolean isEmpty(); @Override Iterator<PlayerGame> iterator(); List<Player> players(); int size(); void clear(); List<PlayerGame> getAll(Predicate<PlayerGame> predicate); static Predicate<PlayerGame> withType(String gameType); static Predicate<PlayerGame> withAll(); static Predicate<PlayerGame> withRoom(String room); Predicate<PlayerGame> withActive(); List<GameType> getGameTypes(); @Override void tick(); void reloadCurrent(PlayerGame playerGame); void reload(Game game, String roomName, JSONObject save); void reloadAll(boolean shuffle); void reloadAll(boolean shuffle, Predicate<PlayerGame> predicate); List<Player> getPlayers(String gameName); void changeLevel(String playerId, int level); void setLevel(String playerId, JSONObject save); void changeRoom(String playerId, String roomName); PlayerGame get(int index); List<PlayerGame> all(); List<PlayerGame> active(); Stream<PlayerGame> stream(); Multimap<String, Room> rooms(); List<String> getRooms(boolean isAll); static final boolean ALL; static final boolean ACTIVE; }### Answer:
@Test public void testClear() { Player player = createPlayer(); Player player2 = createPlayer(); Player player3 = createPlayer(); PlayerGame playerGame1 = playerGames.get(player.getId()); GameField field1 = playerGame1.getGame().getField(); PlayerGame playerGame2 = playerGames.get(player2.getId()); GameField field2 = playerGame2.getGame().getField(); PlayerGame playerGame3 = playerGames.get(player3.getId()); GameField field3 = playerGame3.getGame().getField(); assertEquals(3, playerGames.size()); playerGames.clear(); assertEquals(0, playerGames.size()); verifyRemove(playerGame1, field1); verifyRemove(playerGame2, field2); verifyRemove(playerGame3, field3); }