undeclared class variables were throwing errors with PHP 8.2

question.php

@@ -37,6 +37,14 @@ class qtype_gapfill_question extends question_graded_automatically_with_countbac
      */
     public $answer;
 
+    /**
+     * Only used for testing
+     *
+     * @var $gapstofill int
+     */
+
+    public $gapstofill;
+
     /**
      * Display draggables after the body of the question
      * @var boolean

tests/helper.php

@@ -33,13 +33,18 @@
  */
 class qtype_gapfill_test_helper extends question_test_helper {
 
+    /**
+    * @var int $gapstofill
+    */
+    public $gapstofill;
+
     /**
      *  must be implemented or class made abstract
      *
      * @return string
      */
     public function get_test_questions() {
-        return array('catmat');
+        return ['catmat'];
     }
 
     /**

tests/question_test.php

@@ -43,6 +43,15 @@
  * @coversDefaultClass \question\type\gapfill\question
  */
 class question_test extends \advanced_testcase {
+
+    /** 
+    *
+    * @var qtype_gapfill $gapfill
+    * An instance of the question type
+    */
+    public $qtype;
+
+
     /**
      * Test value returned by questionid_column_name()
      *
@@ -255,6 +264,7 @@ public function test_is_same_response() {
     }
     public function setUp(): void {
         $this->qtype = \question_bank::get_qtype('gapfill');
+
     }
 
     protected function tearDown(): void {