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Testing PUBLIC_URL Environment Variable Integration in Create-React-App

This test suite validates the PUBLIC_URL environment variable functionality in Create React App by testing the PublicUrl component rendering. It ensures proper handling of public asset paths and environment configurations essential for React application deployment.

Test Coverage Overview

The test suite focuses on basic rendering functionality of the PublicUrl component, verifying its ability to handle environment variables correctly.

Tests basic component mounting without crashes
Validates PUBLIC_URL environment variable integration
Ensures proper DOM rendering and cleanup

Implementation Analysis

The testing approach utilizes Jest’s describe and it blocks for organizing test cases, combined with React Testing Library patterns. The implementation employs ReactDOM.render for component mounting verification, following standard React testing practices.

Uses ReactDOM.render for component testing
Implements DOM manipulation for test environment
Follows Jest testing structure

Technical Details

Testing Framework: Jest
React Testing Utilities: ReactDOM
Test Environment: jsdom
Component Under Test: PublicUrl
Environment Variable Testing: PUBLIC_URL

Best Practices Demonstrated

The test implementation showcases clean testing practices with proper component isolation and environment setup. It demonstrates effective use of React testing patterns and environment variable handling.

Isolated component testing
Clean test setup and teardown
Environment variable consideration
Minimal test case design

facebook/create-react-app

packages/react-scripts/fixtures/kitchensink/template/src/features/env/PublicUrl.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 PublicUrl from './PublicUrl';

describe('PUBLIC_URL', () => {
  it('renders without crashing', () => {
    const div = document.createElement('div');
    ReactDOM.render(<PublicUrl />, div);
  });
});