Issue #3228042: Automated Drupal 9 compatibility fixes

composer.json

@@ -4,7 +4,7 @@
   "require" : {
     "php": "~7.1",
     "bartfeenstra/fu": "^0.3.4",
-    "drupal/core": "~8.3"
+    "drupal/core": "^8 || ^9"
   },
   "require-dev" : {
     "drupal/coder": "~8.2.12"

erg.info.yml

 name: Entity Reference Guards
 description: Guards entity references, ensuring they remain synchronized with their targets.
-core: 8.x
+core_version_requirement: ^8.8 || ^9
 type: module

tests/src/Functional/OnDeleteReferentProtectReferentTest.php

@@ -19,6 +19,11 @@ class OnDeleteReferentProtectReferentTest extends BrowserTestBase {
    */
   public static $modules = ['erg_test'];
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
   /**
    * Tests entity reference deletion.
    */
@@ -36,7 +41,7 @@ class OnDeleteReferentProtectReferentTest extends BrowserTestBase {
     $users = $referee->get('users')->referencedEntities();
     $this->assertSame($user->id(), $users[0]->id());
 
-    $this->setExpectedException(EntityStorageException::class);
+    $this->expectException(EntityStorageException::class);
     $user->delete();
   }