add test for Location component

vitest.setup.js

@@ -2,9 +2,60 @@
  * Vitest global setup file.
  * Loads English locale messages into i18n so that
  * translation calls return expected values in tests.
+ *
+ * Provides global stubs for CefSharp IPC bindings.
  */
+
 import { i18n } from './src/plugin/i18n';
 
 import en from './src/localization/en.json';
 
+const noopAsync = () => Promise.resolve('');
+
+globalThis.AppApi = new Proxy({}, { get: () => noopAsync });
+globalThis.WebApi = new Proxy({}, { get: () => noopAsync });
+globalThis.VRCXStorage = new Proxy({}, { get: () => noopAsync });
+globalThis.SQLite = new Proxy({}, { get: () => noopAsync });
+globalThis.LogWatcher = new Proxy({}, { get: () => noopAsync });
+globalThis.Discord = new Proxy({}, { get: () => noopAsync });
+globalThis.AssetBundleManager = new Proxy({}, { get: () => noopAsync });
+
+// Browser API stubs not available in jsdom
+globalThis.speechSynthesis = {
+    getVoices: () => [],
+    cancel: () => {},
+    speak: () => {}
+};
+
+// matchMedia polyfill (standard jsdom workaround)
+Object.defineProperty(window, 'matchMedia', {
+    writable: true,
+    value: vi.fn().mockImplementation((query) => ({
+        matches: false,
+        media: query,
+        onchange: null,
+        addListener: vi.fn(),
+        removeListener: vi.fn(),
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        dispatchEvent: vi.fn()
+    }))
+});
+
+// Notification API stub
+globalThis.Notification = class {
+    static permission = 'denied';
+    static requestPermission = vi.fn().mockResolvedValue('denied');
+    constructor() {}
+    close() {}
+};
+
+// Mock worker-timers to use native timers (workers unavailable in jsdom)
+vi.mock('worker-timers', () => ({
+    setInterval: globalThis.setInterval.bind(globalThis),
+    clearInterval: globalThis.clearInterval.bind(globalThis),
+    setTimeout: globalThis.setTimeout.bind(globalThis),
+    clearTimeout: globalThis.clearTimeout.bind(globalThis)
+}));
+
 i18n.global.setLocaleMessage('en', en);