Initial vitest setup

app/vitest.config.ts

@@ -0,0 +1,21 @@
+/// <reference types="vitest" />
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import path from 'path';
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['./src/test/setup.ts'],
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+  define: {
+    'window.API_BASE_URL': JSON.stringify('http://localhost:8080/api/v1'),
+  },
+});