class ConfigEntityStaticCacheTest

class ConfigEntityStaticCacheTest extends KernelTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'config_test',
    'config_entity_static_cache_test',
  ];
  
  /**
   * The type ID of the entity under test.
   *
   * @var string
   */
  protected $entityTypeId;
  
  /**
   * The entity ID of the entity under test.
   *
   * @var string
   */
  protected $entityId;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->entityTypeId = 'config_test';
    $this->entityId = 'test_1';
    $this->container
      ->get('entity_type.manager')
      ->getStorage($this->entityTypeId)
      ->create([
      'id' => $this->entityId,
      'label' => 'Original label',
    ])
      ->save();
  }
  
  /**
   * Tests that the static cache is working.
   */
  public function testCacheHit() {
    $storage = $this->container
      ->get('entity_type.manager')
      ->getStorage($this->entityTypeId);
    $entity_1 = $storage->load($this->entityId);
    $entity_2 = $storage->load($this->entityId);
    // config_entity_static_cache_test_config_test_load() sets _loadStamp to a
    // random string. If they match, it means $entity_2 was retrieved from the
    // static cache rather than going through a separate load sequence.
    $this->assertSame($entity_1->_loadStamp, $entity_2->_loadStamp);
  }
  
  /**
   * Tests that the static cache is reset on entity save and delete.
   */
  public function testReset() {
    $storage = $this->container
      ->get('entity_type.manager')
      ->getStorage($this->entityTypeId);
    $entity = $storage->load($this->entityId);
    // Ensure loading after a save retrieves the updated entity rather than an
    // obsolete cached one.
    $entity->label = 'New label';
    $entity->save();
    $entity = $storage->load($this->entityId);
    $this->assertSame('New label', $entity->label);
    // Ensure loading after a delete retrieves NULL rather than an obsolete
    // cached one.
    $entity->delete();
    $this->assertNull($storage->load($this->entityId));
  }
  
  /**
   * Tests that the static cache is sensitive to config overrides.
   */
  public function testConfigOverride() {
    /** @var \Drupal\Core\Config\Entity\ConfigEntityStorage $storage */
    $storage = \Drupal::entityTypeManager()->getStorage($this->entityTypeId);
    // Prime the cache prior to adding a config override.
    $storage->load($this->entityId);
    // Add the config override, and ensure that what is loaded is correct
    // despite the prior cache priming.
    \Drupal::configFactory()->addOverride(new ConfigOverrider());
    $entity_override = $storage->load($this->entityId);
    $this->assertSame('Overridden label', $entity_override->label);
    // Load override free to ensure that loading the config entity again does
    // not return the overridden value.
    $entity_no_override = $storage->loadOverrideFree($this->entityId);
    $this->assertNotSame('Overridden label', $entity_no_override->label);
    $this->assertNotSame($entity_override->_loadStamp, $entity_no_override->_loadStamp);
    // Reload the entity and ensure the cache is used.
    $this->assertSame($entity_no_override->_loadStamp, $storage->loadOverrideFree($this->entityId)->_loadStamp);
    // Enable overrides and reload the entity and ensure the cache is used.
    $this->assertSame($entity_override->_loadStamp, $storage->load($this->entityId)->_loadStamp);
  }

}