[ticket/16955] Fix phpdoc annotations and return types

PHPBB3-16955

tests/text_formatter/s9e/factory_test.php

@@ -15,6 +15,16 @@ require_once __DIR__ . '/../../test_framework/phpbb_database_test_case.php';
 
 class phpbb_textformatter_s9e_factory_test extends phpbb_database_test_case
 {
+	/**
+	 * @var phpbb_mock_cache
+	 */
+	private $cache;
+
+	/**
+	 * @var phpbb_mock_event_dispatcher
+	 */
+	private $dispatcher;
+
 	protected function setUp(): void
 	{
 		$this->cache = new phpbb_mock_cache;