Merge pull request #25405 from braders/dynamic-property-infotest

[REF][PHP8.2] Declare file property in CRM_Extension_InfoTest

tests/phpunit/CRM/Extension/InfoTest.php

@@ -6,6 +6,11 @@
  */
 class CRM_Extension_InfoTest extends CiviUnitTestCase {
 
+  /**
+   * @var string|null
+   */
+  private $file;
+
   public function setUp(): void {
     parent::setUp();
     $this->file = NULL;