Code Quality

WillReturnCallbackFallbackToReturnFalseRector

Add a "return false" fallback to a willReturnCallback() closure that only returns booleans, but can fall through without a return

 use PHPUnit\Framework\TestCase;

 final class SomeTest extends TestCase
 {
     public function test()
     {
         $matcher = $this->exactly(2);

         $this->eventMock->expects($matcher)
             ->method('checkContext')
             ->willReturnCallback(function (...$parameters) use ($matcher) {
                 if ($matcher->numberOfInvocations() === 1) {
                     return true;
                 }
                 if ($matcher->numberOfInvocations() === 2) {
                     return false;
                 }
+
+                return false;
             });
     }
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\PHPUnit\CodeQuality\Rector\MethodCall\WillReturnCallbackFallbackToReturnFalseRector;

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

Other rules in the Code Quality set