PHPUnit

What is PHPUnit?

The de facto standard testing framework for PHP, providing a comprehensive set of tools for writing and running unit tests, integration tests, and functional tests. Features assertions, test doubles (mocks and stubs), code coverage analysis, and test fixtures. Part of the PHP testing ecosystem and widely adopted in the PHP community. Powers testing for major PHP frameworks like Laravel, Symfony, and CodeIgniter. Known for its extensive documentation, active community, and integration with PHP development tools.

When to use it

• Essential for unit testing and integration testing in PHP applications.
• Perfect when you need to test PHP classes, functions, and components in isolation or together.
• Ideal for testing Laravel applications, Symfony projects, WordPress plugins, and any PHP codebase.
• Commonly used in PHP development workflows, CI/CD pipelines, and when following test-driven development (TDD) practices.

When NOT to use it

• Non-PHP projects - use language-specific testing frameworks
• End-to-end testing - PHPUnit is for unit/integration testing
• When you need browser testing - use Selenium or Playwright
• JavaScript/TypeScript projects - Jest or Vitest are better suited

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