Expanded class hierarchy of TestMemoryBackend in Search API 8
- class \Drupal\Core\Cache\MemoryBackend implements CacheBackendInterface, CacheTagsInvalidatorInterface
- class \Drupal\Core\Cache\MemoryCache\MemoryCache implements MemoryCacheInterface
- class \Drupal\Core\Cache\MemoryCounterBackend
- class \Drupal\Tests\Core\Asset\TestMemoryBackend
- class \Drupal\Tests\search_api\Kernel\Views\TestMemoryBackend