Add initial test files

Author: realstoman

src/__tests__/App.test.js

@@ -0,0 +1,20 @@
+import { render, screen } from '@testing-library/react';
+import AppBanner from '../components/shared/AppBanner';
+import userEvent from '@testing-library/user-event';
+
+// This runs before each test. This is good instead of having the component render in each test case
+const setup = () => render(<AppBanner />);
+
+// Get user event
+function setupUserEvent(jsx) {
+	return {
+		user: userEvent.setup(),
+		...render(jsx),
+	};
+}
+
+test('it shows the name in banner', () => {
+	setup();
+	const titleElement = screen.getByText(/Hi, Iam Stoman/i);
+	expect(titleElement).toBeInTheDocument();
+});