Drupal Unit Tests

When to Use

• Pure PHP logic with no Drupal dependencies
• Utility functions, data transformations, value objects
• Classes where all dependencies can be mocked

Basic Structure

// tests/src/Unit/MyServiceTest.php
namespace Drupal\Tests\my_module\Unit;

use Drupal\Tests\UnitTestCase;
use Drupal\my_module\Service\MyService;
use Psr\Log\LoggerInterface;