### Question:
VirtualGamePlayerStorage implements GamePlayerStorage<P> { @Override public Collection<P> getAllPlayers() { return storage.values(); }  @Override P getPlayer(UUID player); @Override void addPlayer(UUID player, P gamePlayer); @Override void removePlayer(UUID player); @Override Collection<P> getAllPlayers(); @Override long getAlivePlayerCount(); @Override boolean contains(UUID uuid);  }### Answer:
@Test public void whenGetAllPlayersThenReturnedAllPlayers() { Set<GamePlayer> playerSet = new HashSet<>(); for (int i = 0; i < 10; i++) { playerSet.add(putPlayer()); } assertEquals(playerSet, new HashSet<>(storage.getAllPlayers())); }