final Map<String, Integer> pricelist = new HashMap<String, Integer>();
pricelist.put("fado city scroll", 1000);
pricelist.put("empty scroll", 3000);
final SellerBehaviour sb = new SellerBehaviour(pricelist);
final SpeakerNPC npc = new SpeakerNPC("npc");
npc.addGreeting("Hello!");
new SellerAdder().addSeller(npc, sb);
final Player player = PlayerTestHelper.createPlayer("bob");
npc.getEngine().step(player, "hi");
assertEquals("Hello!", getReply(npc));