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Validating CSS Modules Component Integration in Create-React-App

This test suite validates the integration and functionality of CSS Modules within Create React App. It ensures proper inclusion and rendering of components using CSS Modules styling, a critical feature for component-based style isolation.

Test Coverage Overview

The test coverage focuses on the fundamental integration of CSS Modules in React components.

Basic component rendering verification
CSS Modules inclusion validation
Component mounting lifecycle checks
DOM integration testing

Implementation Analysis

The testing approach employs Jest’s describe/it pattern for organizing test cases, with ReactDOM for component rendering validation.

Uses ReactDOM.render for component mounting
Implements DOM element creation for testing
Follows component isolation principles

Technical Details

Testing Framework: Jest
React Testing Dependencies: ReactDOM
Test Environment: jsdom
Component Under Test: CssModulesInclusion
Test Scope: Unit testing

Best Practices Demonstrated

The test suite exemplifies clean and efficient testing practices for React components.

Isolated component testing
Clear test case organization
Proper DOM cleanup
Focused test scope
Minimal test complexity

facebook/create-react-app

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

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