test: add item schema tests

__tests__/schema.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, test } from "bun:test";
+import { ItemSchema, getItemIndexByName, getTradableStatusByDefindex, getTradableStatusByName} from '../src/content/schemaService'
+
+const mockSchema: ItemSchema = {
+    '5021': { name: 'Mann Co. Supply Crate Key', tradable: true },
+    '15013': { name: 'Non-Tradable Item', tradable: false }
+}
+
+describe('Schema Service', () => {
+
+    test('getItemIndexByName returns correct defindex', () => {
+        expect(getItemIndexByName(mockSchema, 'Mann Co. Supply Crate Key')).toBe(5021)
+        expect(getItemIndexByName(mockSchema, 'Non-Existent Item')).toBeNull()
+    })
+
+    test('getTradableStatusByDefindex returns correct status', () => {
+        expect(getTradableStatusByDefindex(mockSchema, 5021)).toBe(true)
+        expect(getTradableStatusByDefindex(mockSchema, 15013)).toBe(false)
+        expect(() => getTradableStatusByDefindex(mockSchema, 999)).toThrow()
+    })
+
+    test('getTradableStatusByName returns correct status', () => {
+        expect(getTradableStatusByName(mockSchema, 'Mann Co. Supply Crate Key')).toBe(true)
+        expect(getTradableStatusByName(mockSchema, 'Non-Tradable Item')).toBe(false)
+        expect(getTradableStatusByName(mockSchema, 'Non-Existent Item')).toBe(true)
+    })
+})