assertEntityTypeSchema example

  public function testFieldableEntityTypeUpdates($initial_rev, $initial_mul, $new_rev, $new_mul, $data_migration_supported) {
    // The 'entity_test_update' entity type is neither revisionable nor     // translatable by default, so we need to get it into the initial testing     // state. This also covers the "no existing data" scenario for fieldable     // entity type updates.     if ($initial_rev || $initial_mul) {
      $entity_type = $this->getUpdatedEntityTypeDefinition($initial_rev, $initial_mul);
      $field_storage_definitions = $this->getUpdatedFieldStorageDefinitions($initial_rev, $initial_mul);

      $this->entityDefinitionUpdateManager->updateFieldableEntityType($entity_type, $field_storage_definitions);
      $this->assertEntityTypeSchema($initial_rev, $initial_mul);
    }

    // Add a few entities so we can test the data copying step.     $this->insertData($initial_rev, $initial_mul);

    $updated_entity_type = $this->getUpdatedEntityTypeDefinition($new_rev, $new_mul);
    $updated_field_storage_definitions = $this->getUpdatedFieldStorageDefinitions($new_rev, $new_mul);

    if (!$data_migration_supported) {
      $this->expectException(EntityStorageException::class);
      $this->expectExceptionMessage('Converting an entity type from revisionable to non-revisionable or from translatable to non-translatable is not supported.');
    }