ExpressionCreateMockToCreateStubRector

Replace createMock() assigned to variable that is only used as arg with no expectations, to createStub()

 use PHPUnit\Framework\TestCase;

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

         $someObject = new SomeClass($mock);
         $this->assertSame($mock, $someObject->getDependency());
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\PHPUnit\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector;

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