feat: add upgrade scrolls

src/engine/systems/__tests__/UpgradeManager.test.ts

@@ -0,0 +1,66 @@
+import { describe, it, expect } from 'vitest';
+import { UpgradeManager } from '../UpgradeManager';
+import { createMeleeWeapon, createArmour, createConsumable } from '../../../core/config/Items';
+import type { WeaponItem, ArmourItem } from '../../../core/types';
+
+describe('UpgradeManager', () => {
+    it('should correctly identify upgradeable items', () => {
+        const sword = createMeleeWeapon("iron_sword");
+        const armor = createArmour("leather_armor");
+        const potion = createConsumable("health_potion");
+
+        expect(UpgradeManager.canUpgrade(sword)).toBe(true);
+        expect(UpgradeManager.canUpgrade(armor)).toBe(true);
+        expect(UpgradeManager.canUpgrade(potion)).toBe(false);
+    });
+
+    it('should upgrade weapon stats and name', () => {
+        const sword = createMeleeWeapon("iron_sword") as WeaponItem;
+        const initialAttack = sword.stats.attack!;
+        const initialName = sword.name;
+
+        const success = UpgradeManager.applyUpgrade(sword);
+
+        expect(success).toBe(true);
+        expect(sword.stats.attack).toBe(initialAttack + 1);
+        expect(sword.upgradeLevel).toBe(1);
+        expect(sword.name).toBe(`${initialName} +1`);
+    });
+
+    it('should upgrade armour stats and name', () => {
+        const armor = createArmour("leather_armor") as ArmourItem;
+        const initialDefense = armor.stats.defense!;
+        const initialName = armor.name;
+
+        const success = UpgradeManager.applyUpgrade(armor);
+
+        expect(success).toBe(true);
+        expect(armor.stats.defense).toBe(initialDefense + 1);
+        expect(armor.upgradeLevel).toBe(1);
+        expect(armor.name).toBe(`${initialName} +1`);
+    });
+
+    it('should handle sequential upgrades', () => {
+        const sword = createMeleeWeapon("iron_sword") as WeaponItem;
+        const initialAttack = sword.stats.attack!;
+        const initialName = sword.name;
+
+        UpgradeManager.applyUpgrade(sword); // +1
+        UpgradeManager.applyUpgrade(sword); // +2
+
+        expect(sword.stats.attack).toBe(initialAttack + 2);
+        expect(sword.upgradeLevel).toBe(2);
+        expect(sword.name).toBe(`${initialName} +2`);
+    });
+
+    it('should not upgrade non-upgradeable items', () => {
+        const potion = createConsumable("health_potion");
+        const initialName = potion.name;
+
+        const success = UpgradeManager.applyUpgrade(potion);
+
+        expect(success).toBe(false);
+        expect(potion.upgradeLevel).toBeUndefined();
+        expect(potion.name).toBe(initialName);
+    });
+});