MockObjectArgCreateStubToCreateMockRector

Change createStub() to createMock(), when the created variable is passed to a method that requires MockObject type

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

 final class SomeTest extends TestCase
 {
     public function test()
     {
-        $someMock = $this->createStub(SomeClass::class);
+        $someMock = $this->createMock(SomeClass::class);
         $this->prepareMock($someMock);
     }

     private function prepareMock(MockObject $someMock): void
     {
         $someMock->expects($this->once())
             ->method('someMethod');
     }
 }

Configure your rector.php:

<?php

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

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