ReplaceAtMethodWithDesiredMatcherRector

Find another rule

Replace at() method call with desired matcher

-$mock->expects($this->at(0))
+$mock->expects($this->never())
     ->method('foo')
     ->willReturn('1');

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\PHPUnit\PHPUnit90\Rector\MethodCall\ReplaceAtMethodWithDesiredMatcherRector;

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