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Testing Async/Await Component Rendering in Create-React-App

This test suite validates the async/await functionality in React components within Create React App. It focuses on ensuring proper component rendering and async operation handling using modern JavaScript features.

Test Coverage Overview

The test coverage focuses on the basic rendering capabilities of components using async/await patterns.

Tests component mounting with async operations
Validates Promise-based rendering flow
Ensures proper DOM integration
Covers component lifecycle with async callbacks

Implementation Analysis

The testing approach utilizes Jest’s asynchronous testing capabilities combined with React’s rendering lifecycle.

The implementation leverages Promise-based patterns with ReactDOM.render, demonstrating modern JavaScript async/await syntax integration with React component testing.

Uses Promise-based component rendering
Implements async callback patterns
Employs ReactDOM test utilities

Technical Details

Jest test framework
React DOM testing utilities
Async/await syntax
Promise-based assertions
DOM manipulation utilities

Best Practices Demonstrated

The test exemplifies clean async testing patterns in React applications, following established best practices for component testing.

Proper async test structure
Clean component cleanup
Effective Promise handling
Isolated component testing

facebook/create-react-app

packages/react-scripts/fixtures/kitchensink/template/src/features/syntax/AsyncAwait.test.js

            
/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import React from 'react';
import ReactDOM from 'react-dom';
import AsyncAwait from './AsyncAwait';

describe('async/await', () => {
  it('renders without crashing', () => {
    const div = document.createElement('div');
    return new Promise(resolve => {
      ReactDOM.render(<AsyncAwait onReady={resolve} />, div);
    });
  });
});