Add configurable subjects to question sets

administrator/components/com_testquestions/src/Table/SubjectTable.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Komponent\Component\Testquestions\Administrator\Table;
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\Table\Table;
+use Joomla\Database\DatabaseDriver;
+
+class SubjectTable extends Table
+{
+    public function __construct(DatabaseDriver $db)
+    {
+        parent::__construct('#__testquestions_subjects', 'id', $db);
+    }
+
+    public function check($updateNulls = false): bool
+    {
+        $this->title = trim((string) $this->title);
+
+        return $this->title !== '' && parent::check($updateNulls);
+    }
+}