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Testing CSS Inclusion Components in Create React App

This test suite validates CSS inclusion functionality in Create React App components, ensuring proper stylesheet loading and integration. The tests verify basic component rendering with associated CSS dependencies.

Test Coverage Overview

The test coverage focuses on validating basic CSS inclusion and component rendering capabilities.

Verifies component mounting with CSS dependencies
Tests basic component rendering functionality
Ensures DOM integration with stylesheets

Implementation Analysis

The testing approach utilizes Jest and React Testing Library patterns for component validation. The implementation employs a straightforward mounting test to verify CSS inclusion doesn’t break component rendering.

Uses ReactDOM.render for component mounting
Implements document.createElement for test container
Follows React component testing patterns

Technical Details

Testing Framework: Jest
Component Testing: React Testing Library
DOM Manipulation: ReactDOM
Test Environment: jsdom
Component: CssInclusion

Best Practices Demonstrated

The test suite demonstrates clean and efficient testing practices for React components with CSS dependencies.

Isolated component testing
Proper test setup and teardown
Clear test case organization
Minimal test complexity

facebook/create-react-app

packages/react-scripts/fixtures/kitchensink/template/src/features/webpack/CssInclusion.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 CssInclusion from './CssInclusion';

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