SuffixMockObjectPropertyRector

Find another rule

Suffix mock object property names with "Mock" to clearly separate from real objects later on

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

 final class MockingEntity extends TestCase
 {
-    private MockObject $simpleObject;
+    private MockObject $simpleObjectMock;

     protected function setUp(): void
     {
-        $this->simpleObject = $this->createMock(SimpleObject::class);
+        $this->simpleObjectMock = $this->createMock(SimpleObject::class);
     }

     public function test()
     {
-        $this->simpleObject->method('someMethod')->willReturn('someValue');
+        $this->simpleObjectMock->method('someMethod')->willReturn('someValue');
     }
 }

Configure your rector.php:

<?php

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

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