Back to Repositories

Testing TypeScript Build Pipeline Implementation in Create React App

This test suite validates core build and test functionality for TypeScript-based React applications within Create React App. It implements critical smoke tests to verify development and production builds along with test environment configurations.

Test Coverage Overview

The test suite provides comprehensive coverage of essential build and test processes for TypeScript applications.

Development build validation through smoke tests
Production build verification
Test runner configuration with Node environment
Core build pipeline validation

Implementation Analysis

The testing approach utilizes async/await patterns for handling build and test script executions. The implementation leverages shared test setup utilities to maintain consistency across test scenarios.

Async test execution pattern
Shared test setup infrastructure
Boolean fulfillment verification
Environment-specific configurations

Technical Details

Jest test framework integration
Node.js test environment configuration
Shared test setup utilities
Strict mode JavaScript implementation
Build script validation tools

Best Practices Demonstrated

The test suite exemplifies robust testing practices by isolating build and test processes while maintaining clear separation of concerns.

Isolated test cases for different build modes
Environment-specific test configurations
Consistent assertion patterns
Modular test setup approach

facebook/create-react-app

test/fixtures/typescript-advanced/index.test.js

            
'use strict';

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

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);
});
test('passes tests', async () => {
  const { fulfilled } = await testSetup.scripts.test({
    jestEnvironment: 'node',
  });
  expect(fulfilled).toBe(true);
});