✅ test: add vitest.setup.ts

vite.config.ts

@@ -5,6 +5,8 @@ import react from '@vitejs/plugin-react-swc'
 export default defineConfig({
   plugins: [react()],
   test: {
-    environment: 'jsdom'
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['./vitest.setup.ts']
   }
 })

vitest.setup.ts

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';