[app/client] Get test (originated from create-react-app) running

app/client/package.json

@@ -68,7 +68,8 @@
   },
   "scripts": {
     "build": "node scripts/build.js",
-    "test": "node scripts/test.js"
+    "test": "jest --ci",
+    "test:dev": "jest"
   },
   "eslintConfig": {
     "extends": "react-app"

app/client/src/App.test.js

@@ -2,8 +2,8 @@ import React from 'react';
 import { render } from '@testing-library/react';
 import App from './App';
 
-test('renders learn react link', () => {
+test('renders header title', () => {
   const { getByText } = render(<App />);
-  const linkElement = getByText(/learn react/i);
+  const linkElement = getByText(/ToDo App/i);
   expect(linkElement).toBeInTheDocument();
 });