Add more unit tests for shops and quest related architecture

Fixed bug where quests could be repeatedly finished
Fixed bug where ironman status wasn't checked when buying overstocked items
Fixed bug where selling multiple items at a time that weren't listed in a shop would not succeed
Fixed bug where shop restocking would sometimes interrupt if a shop stock item was in a null slot

Server/src/test/kotlin/TestUtils.kt

@@ -0,0 +1,20 @@
+import core.game.node.entity.player.Player
+import core.game.node.entity.player.info.PlayerDetails
+import core.game.node.entity.player.link.IronmanMode
+import core.game.node.item.Item
+import rs09.game.ai.ArtificialSession
+import rs09.game.content.global.shops.Shop
+import rs09.game.content.global.shops.ShopItem
+
+object TestUtils {
+    fun getMockPlayer(name: String, ironman: IronmanMode = IronmanMode.NONE): Player {
+        val p = Player(PlayerDetails(name, name))
+        p.details.session = ArtificialSession.getSingleton()
+        p.ironmanManager.mode = ironman
+        return p
+    }
+
+    fun getMockShop(name: String, general: Boolean, vararg stock: Item) : Shop {
+        return Shop(name, stock.map { ShopItem(it.id, it.amount, 100) }.toTypedArray(), general)
+    }
+}