feat: configure Vitest testing framework

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package.json

@@ -18,7 +18,10 @@
     "build:unpack": "npm run build && electron-builder --dir",
     "build:win": "npm run build && electron-builder --win",
     "build:mac": "electron-vite build && electron-builder --mac",
-    "build:linux": "electron-vite build && electron-builder --linux"
+    "build:linux": "electron-vite build && electron-builder --linux",
+    "test": "vitest",
+    "test:run": "vitest run",
+    "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
     "@electron-toolkit/preload": "^3.0.2",
@@ -42,6 +45,7 @@
     "@types/react-dom": "^19.2.3",
     "@types/uuid": "^10.0.0",
     "@vitejs/plugin-react": "^5.1.1",
+    "@vitest/coverage-v8": "^4.0.18",
     "electron": "^39.2.6",
     "electron-builder": "^26.0.12",
     "electron-vite": "^5.0.0",

tests/setup.ts

@@ -0,0 +1,15 @@
+import { beforeAll, afterAll } from 'vitest';
+import dotenv from 'dotenv';
+
+// Load environment variables
+dotenv.config({ path: '.env' });
+
+beforeAll(async () => {
+  // Global test setup
+  console.log('Test suite starting...');
+});
+
+afterAll(async () => {
+  // Global test teardown
+  console.log('Test suite completed.');
+});

vitest.config.ts

@@ -0,0 +1,14 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    include: ['tests/**/*.{test,spec}.{ts,tsx}'],
+    exclude: ['node_modules', 'dist', 'out'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+    },
+  },
+});