re-added tests for when we ever decide to use them

src/App.test.tsx

@@ -0,0 +1,9 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('Home screen contains \'MauMau\'', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/MauMau/i);
+  expect(linkElement).toBeInTheDocument();
+});