Fixed tests

frontend/src/App.test.jsx

@@ -0,0 +1,16 @@
+// frontend/src/App.test.jsx
+
+import { render, screen } from '@testing-library/react';
+import { expect, test } from 'vitest';
+import App from './App';
+
+test('renders the Vite and React logos', () => {
+    // 1. Render the component
+    render(<App />);
+
+    // 2. Search for elements
+    const heading = screen.getByText(/Vite \+ React/i);
+
+    // 3. Assert (the "expect" part)
+    expect(heading).toBeInTheDocument();
+});