Update ranged weapon quickslot text to match stackable items

src/engine/__tests__/inventory.test.ts

@@ -0,0 +1,113 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import { ItemManager } from "../../scenes/systems/ItemManager";
+import type { World, CombatantActor, Item } from "../../core/types";
+import { EntityManager } from "../../engine/EntityManager";
+
+describe("ItemManager - Stacking Logic", () => {
+    let itemManager: ItemManager;
+    let entityManager: EntityManager;
+    let world: World;
+    let player: CombatantActor;
+
+    beforeEach(() => {
+        world = {
+            width: 10,
+            height: 10,
+            tiles: [],
+            actors: new Map(),
+            exit: { x: 9, y: 9 }
+        } as any;
+
+        entityManager = new EntityManager(world);
+        itemManager = new ItemManager(world, entityManager);
+
+        player = {
+            id: 0,
+            pos: { x: 1, y: 1 },
+            category: "combatant",
+            isPlayer: true,
+            type: "player",
+            inventory: { gold: 0, items: [] },
+            stats: {} as any,
+            equipment: {} as any,
+            speed: 1,
+            energy: 0
+        };
+        world.actors.set(0, player);
+    });
+
+    it("should stack stackable items when picked up", () => {
+        const potion: Item = {
+            id: "potion",
+            name: "Potion",
+            type: "Consumable",
+            textureKey: "items",
+            spriteIndex: 0,
+            stackable: true,
+            quantity: 1
+        };
+
+        // First potion
+        itemManager.spawnItem(potion, { x: 1, y: 1 });
+        itemManager.tryPickup(player);
+        
+        expect(player.inventory!.items.length).toBe(1);
+        expect(player.inventory!.items[0].quantity).toBe(1);
+
+        // Second potion
+        itemManager.spawnItem(potion, { x: 1, y: 1 });
+        itemManager.tryPickup(player);
+
+        expect(player.inventory!.items.length).toBe(1);
+        expect(player.inventory!.items[0].quantity).toBe(2);
+    });
+
+    it("should NOT stack non-stackable items", () => {
+        const sword: Item = {
+            id: "sword",
+            name: "Sword",
+            type: "Weapon",
+            weaponType: "melee",
+            textureKey: "items",
+            spriteIndex: 1,
+            stackable: false,
+            stats: { attack: 1 }
+        } as any;
+
+        // First sword
+        itemManager.spawnItem(sword, { x: 1, y: 1 });
+        itemManager.tryPickup(player);
+        
+        expect(player.inventory!.items.length).toBe(1);
+
+        // Second sword
+        itemManager.spawnItem(sword, { x: 1, y: 1 });
+        itemManager.tryPickup(player);
+
+        expect(player.inventory!.items.length).toBe(2);
+    });
+
+    it("should sum quantities of stackable items correctly", () => {
+        const ammo: Item = {
+            id: "ammo",
+            name: "Ammo",
+            type: "Ammo",
+            textureKey: "items",
+            spriteIndex: 2,
+            stackable: true,
+            quantity: 10,
+            ammoType: "9mm"
+        };
+
+        itemManager.spawnItem(ammo, { x: 1, y: 1 });
+        itemManager.tryPickup(player);
+        
+        expect(player.inventory!.items[0].quantity).toBe(10);
+
+        const moreAmmo = { ...ammo, quantity: 5 };
+        itemManager.spawnItem(moreAmmo, { x: 1, y: 1 });
+        itemManager.tryPickup(player);
+
+        expect(player.inventory!.items[0].quantity).toBe(15);
+    });
+});