docs: add @testtag

Author: kenjis

system/CLI/CLI.php

@@ -1122,6 +1122,8 @@ protected static function fwrite($handle, string $string)
 
     /**
      * Testing purpose only
+     *
+     * @testTag
      */
     public static function setInputOutput(InputOutput $io): void
     {
@@ -1130,6 +1132,8 @@ public static function setInputOutput(InputOutput $io): void
 
     /**
      * Testing purpose only
+     *
+     * @testTag
      */
     public static function resetInputOutput(): void
     {