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diff --git a/web/core/modules/system/tests/modules/entity_test/src/EntityTestDefinitionSubscriber.php b/web/core/modules/system/tests/modules/entity_test/src/EntityTestDefinitionSubscriber.php
new file mode 100644
index 000000000..2b06d80bd
--- /dev/null
+++ b/web/core/modules/system/tests/modules/entity_test/src/EntityTestDefinitionSubscriber.php
@@ -0,0 +1,126 @@
+<?php
+
+namespace Drupal\entity_test;
+
+use Drupal\Core\Entity\EntityTypeEvents;
+use Drupal\Core\Entity\EntityTypeEventSubscriberTrait;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\EntityTypeListenerInterface;
+use Drupal\Core\Field\FieldStorageDefinitionEvents;
+use Drupal\Core\Field\FieldStorageDefinitionEventSubscriberTrait;
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+use Drupal\Core\Field\FieldStorageDefinitionListenerInterface;
+use Drupal\Core\State\StateInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Test entity type and field storage definition event subscriber.
+ */
+class EntityTestDefinitionSubscriber implements EventSubscriberInterface, EntityTypeListenerInterface, FieldStorageDefinitionListenerInterface {
+
+  use EntityTypeEventSubscriberTrait;
+  use FieldStorageDefinitionEventSubscriberTrait;
+
+  /**
+   * The state service.
+   *
+   * @var \Drupal\Core\State\StateInterface
+   */
+  protected $state;
+
+  /**
+   * Flag determining whether events should be tracked.
+   *
+   * @var bool
+   */
+  protected $trackEvents = FALSE;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(StateInterface $state) {
+    $this->state = $state;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    return static::getEntityTypeEvents() + static::getFieldStorageDefinitionEvents();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onEntityTypeCreate(EntityTypeInterface $entity_type) {
+    $this->storeEvent(EntityTypeEvents::CREATE);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onEntityTypeUpdate(EntityTypeInterface $entity_type, EntityTypeInterface $original) {
+    $this->storeEvent(EntityTypeEvents::UPDATE);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onEntityTypeDelete(EntityTypeInterface $entity_type) {
+    $this->storeEvent(EntityTypeEvents::DELETE);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onFieldStorageDefinitionCreate(FieldStorageDefinitionInterface $storage_definition) {
+    $this->storeEvent(FieldStorageDefinitionEvents::CREATE);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onFieldStorageDefinitionUpdate(FieldStorageDefinitionInterface $storage_definition, FieldStorageDefinitionInterface $original) {
+    $this->storeEvent(FieldStorageDefinitionEvents::UPDATE);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function onFieldStorageDefinitionDelete(FieldStorageDefinitionInterface $storage_definition) {
+    $this->storeEvent(FieldStorageDefinitionEvents::DELETE);
+  }
+
+  /**
+   * Enables event tracking.
+   */
+  public function enableEventTracking() {
+    $this->trackEvents = TRUE;
+  }
+
+  /**
+   * Checks whether an event has been dispatched.
+   *
+   * @param string $event_name
+   *   The event name.
+   *
+   * @return bool
+   *   TRUE if the event has been dispatched, FALSE otherwise.
+   */
+  public function hasEventFired($event_name) {
+    return (bool) $this->state->get($event_name);
+  }
+
+  /**
+   * Stores the specified event.
+   *
+   * @param string $event_name
+   *   The event name.
+   */
+  protected function storeEvent($event_name) {
+    if ($this->trackEvents) {
+      $this->state->set($event_name, TRUE);
+    }
+  }
+
+}