Try Rector Online | Rector - Automated Way to Instantly Upgrade and Refactor any PHP code

Run Rector on your code to see what it can do for you:

 
 class MyTest extends PHPUnit\Framework\TestCase
 {
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         // blah blah
     }
 }

PHP snippet to change

<?php

class MyTest extends PHPUnit\Framework\TestCase
{
    public static function setUpBeforeClass()
    {
        // blah blah
    }
}

Applied Rules:

AddReturnTypeDeclarationRector

Not a change you expect?

Create an issue on GitHub
...or to speed up fix – add a test fixture

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\PHPUnit\Set\PHPUnitSetList;

return RectorConfig::configure()
    ->withSets([
        PHPUnitSetList::PHPUNIT_80,
    ]);

Rector version: 796207 - released at 2025-12-10 18:45