test: setup

web/src/App.test.js

@@ -1,9 +1,8 @@
 import React from 'react'
-import ReactDOM from 'react-dom'
+import { render } from '@testing-library/react'
 import App from './App'
 
-it('renders without crashing', () => {
-  const div = document.createElement('div')
-  ReactDOM.render(<App />, div)
-  ReactDOM.unmountComponentAtNode(div)
+it('renders welcome message', () => {
+  const { getByText } = render(<App />)
+  expect(getByText('name new project')).toBeInTheDocument()
 })

web/src/setupTests.js

@@ -0,0 +1,5 @@
+// react-testing-library renders your components to document.body,
+// this will ensure they're removed after each test.
+import '@testing-library/react/cleanup-after-each'
+// this adds jest-dom's custom assertions
+import '@testing-library/jest-dom/extend-expect'