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Testing Global SCSS Asset Resolution in Create React App

This test suite validates the global SCSS asset resolution functionality in Create React App. It focuses on verifying build processes in both development and production environments, ensuring proper SCSS asset handling and resolution.

Test Coverage Overview

The test suite provides comprehensive coverage of build processes for SCSS asset resolution.

Key areas tested include:

Development environment build verification
Production build validation
Conditional test execution based on environment

The suite handles edge cases through environment-specific test execution, particularly managing local development scenarios.

Implementation Analysis

The testing approach utilizes Jest’s async/await pattern for handling build processes. It implements a shared test setup module for consistency across environments.

Key implementation features:

Environment-aware test execution
Async test patterns for build processes
Shared test configuration
Smoke test capabilities for development builds

Technical Details

Testing infrastructure includes:

Jest as the primary testing framework
Custom test-setup utility module
Environment detection mechanisms
Build script integrations
Assertion handling for build status verification

Best Practices Demonstrated

The test suite exemplifies several testing best practices in React application development.

Notable practices include:

Environment-specific test handling
Asynchronous test pattern implementation
Modular test setup
Clear build status verification
Separation of development and production tests

facebook/create-react-app

test/fixtures/global-scss-asset-resolution/index.test.js

            
'use strict';

const testSetup = require('../__shared__/test-setup');

if (testSetup.isLocal) {
  // TODO: make this work locally
  test('skipped locally', () => {});
} else {
  test('builds in development', async () => {
    const { fulfilled } = await testSetup.scripts.start({ smoke: true });
    expect(fulfilled).toBe(true);
  });

  test('builds in production', async () => {
    const { fulfilled } = await testSetup.scripts.build();
    expect(fulfilled).toBe(true);
  });
}