Initialize HemHub project foundation

frontend/src/App.test.tsx

@@ -0,0 +1,21 @@
+import { render, screen } from '@testing-library/react'
+import { afterEach, expect, test, vi } from 'vitest'
+import App from './App'
+
+afterEach(() => {
+  vi.restoreAllMocks()
+})
+
+test('visar sidans rubrik', () => {
+  vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+    new Response(JSON.stringify({ status: 'UP' }), {
+      status: 200,
+      headers: { 'Content-Type': 'application/json' },
+    }),
+  )
+
+  render(<App />)
+
+  expect(screen.getByRole('heading', { name: 'HemHub' })).toBeInTheDocument()
+})
+