ExpectsParamToMockObjectRector

Change param type of a private test method to MockObject, when expects() is called on it

+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;

 final class SomeTest extends TestCase
 {
-    private function prepareUserMock(SomeUser $user): void
+    private function prepareUserMock(MockObject $user): void
     {
         $user->expects($this->once())
             ->method('getId');
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\PHPUnit\PHPUnit110\Rector\ClassMethod\ExpectsParamToMockObjectRector;

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