test: add Vitest configuration and setup

- Add vitest.config.ts with jsdom environment and path aliases
- Add tests/setup.ts with mocks for Tauri API, crypto, and localStorage
- Add test:coverage script to package.json

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/package.json

@@ -22,6 +22,7 @@
     "tauri:build:msi:debug": "pnpm prepare:openfang-runtime && node scripts/tauri-build-bundled.mjs --debug --bundles msi",
     "test": "vitest run",
     "test:watch": "vitest",
+    "test:coverage": "vitest run --coverage",
     "test:e2e": "playwright test --project chromium --config=tests/e2e/playwright.config.ts",
     "test:e2e:ui": "playwright test --project chromium-ui --config=tests/e2e/playwright.config.ts --grep 'UI'",
     "test:e2e:headed": "playwright test --project chromium-headed --headed",

desktop/tests/setup.ts

@@ -0,0 +1,76 @@
+import '@testing-library/jest-dom';
+import { vi } from 'vitest';
+import { webcrypto } from 'node:crypto';
+
+// Polyfill Web Crypto API for Node.js test environment
+Object.defineProperty(global, 'crypto', {
+  value: webcrypto,
+  configurable: true,
+});
+
+// Mock Tauri API
+vi.mock('@tauri-apps/api/core', () => ({
+  invoke: vi.fn(),
+}));
+
+// Mock Tauri runtime check
+vi.mock('../src/lib/tauri-gateway', () => ({
+  isTauriRuntime: () => false,
+  getGatewayClient: vi.fn(),
+  startLocalGateway: vi.fn(),
+  stopLocalGateway: vi.fn(),
+  getLocalGatewayStatus: vi.fn(),
+  getLocalGatewayAuth: vi.fn(),
+  prepareLocalGatewayForTauri: vi.fn(),
+  approveLocalGatewayDevicePairing: vi.fn(),
+  getOpenFangProcessList: vi.fn(),
+  getOpenFangProcessLogs: vi.fn(),
+}));
+
+// Mock localStorage with export for test access
+export const localStorageMock = (() => {
+  let store: Record<string, string> = {};
+  return {
+    getItem: (key: string) => store[key] || null,
+    setItem: (key: string, value: string) => {
+      store[key] = value;
+    },
+    removeItem: (key: string) => {
+      delete store[key];
+    },
+    clear: () => {
+      store = {};
+    },
+    get length() {
+      return Object.keys(store).length;
+    },
+    key: (index: number) => {
+      const keys = Object.keys(store);
+      return keys[index] || null;
+    },
+  };
+})();
+
+Object.defineProperty(global, 'localStorage', {
+  value: localStorageMock,
+  configurable: true,
+});
+
+// Mock crypto.subtle for tests (already set via webcrypto above, but ensure subtle mock works)
+const subtleMock = {
+  encrypt: vi.fn(),
+  decrypt: vi.fn(),
+  generateKey: vi.fn(),
+  deriveKey: vi.fn(),
+  importKey: vi.fn(),
+  exportKey: vi.fn(),
+  digest: vi.fn(),
+  sign: vi.fn(),
+  verify: vi.fn(),
+};
+
+// Override subtle if needed for specific test scenarios
+Object.defineProperty(global.crypto, 'subtle', {
+  value: subtleMock,
+  configurable: true,
+});

desktop/vitest.config.ts

@@ -0,0 +1,36 @@
+import { defineConfig } from 'vitest/config';
+import react from '@vitejs/plugin-react';
+import path from 'path';
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: [path.resolve(__dirname, './tests/setup.ts')],
+    include: ['tests/**/*.test.ts', 'tests/**/*.test.tsx'],
+    exclude: ['tests/e2e/**', 'node_modules/**'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+      exclude: [
+        'node_modules/**',
+        'tests/**',
+        '**/*.d.ts',
+        '**/*.config.*',
+        'src/main.tsx',
+      ],
+      thresholds: {
+        lines: 60,
+        functions: 60,
+        branches: 60,
+        statements: 60,
+      },
+    },
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+});