testing of example

services/client/package.json

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+{
+  "name": "client",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test --watchAll=false",
+    "eject": "react-scripts eject"
+  },
+  "dependencies": {
+    "react": "^18.0.0",
+    "react-dom": "^18.0.0",
+    "react-scripts": "5.0.1"
+  },
+  "devDependencies": {
+    "@testing-library/react": "^13.0.0",
+    "jest": "^29.0.0"
+  }
+}

services/client/src/App.js

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+import React from 'react';
+
+function App() {
+  return (
+    <div>
+      <h1>Hello, World!</h1>
+    </div>
+  );
+}
+
+export default App;

services/client/src/App.test.js

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+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders Hello, World!', () => {
+  render(<App />);
+  const headingElement = screen.getByText(/Hello, World!/i);
+  expect(headingElement).toBeInTheDocument();
+});