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Testing Extension-less Component Imports in Create React App

This test suite validates the proper rendering of components without file extensions in Create React App. It focuses on ensuring that components can be imported and rendered successfully without explicitly specifying file extensions, demonstrating webpack’s module resolution capabilities.

Test Coverage Overview

The test coverage focuses on the basic rendering functionality of components without file extensions. It validates:

Component mounting without crashes
Webpack’s module resolution for extensionless imports
React component integration with DOM

Implementation Analysis

The testing approach implements a straightforward Jest unit test using React Testing Library patterns. It utilizes React’s core rendering functionality to mount components in a controlled test environment, verifying the successful integration between webpack’s module resolution and React’s rendering pipeline.

Technical Details

Jest as the testing framework
ReactDOM for component rendering
Document createElement for test container
Webpack module resolution configuration
MIT license compliance

Best Practices Demonstrated

The test exemplifies clean testing practices by isolating component rendering in a controlled environment. It demonstrates:

Proper test isolation
Minimal test setup
Clear test descriptions
Standard React testing patterns

facebook/create-react-app

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

describe('no ext inclusion', () => {
  it('renders without crashing', () => {
    const div = document.createElement('div');
    ReactDOM.render(<NoExtInclusion />, div);
  });
});