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SetUpBeforeClassToSetUpRector

Change setUpBeforeClass() to setUp() if not needed

 use PHPUnit\Framework\TestCase;

 final class SomeTest extends TestCase
 {
-    private static $someService;
+    private $someService;

-    public static function setUpBeforeClass(): void
+    protected function setUp(): void
     {
-        self::$someService = new SomeService();
+        $this->someService = new SomeService();
     }

     public function test()
     {
-        $result = self::$someService->getValue();
+        $result = $this->someService->getValue();
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\PHPUnit\CodeQuality\Rector\Class_\SetUpBeforeClassToSetUpRector;

return RectorConfig::configure()
    ->withRules([
        SetUpBeforeClassToSetUpRector::class,
    ]);