oficial/app/tests/extension/ObjectHasMethodTrait.php

<?php
namespace Tests\Extension;

trait ObjectHasMethodTrait
{
    public function assertObjectHasMethod(string $method, object $object): void
    {
        $this->assertTrue(method_exists($object, $method), sprintf('The object %s does not have the method %s', get_class($object), $method));
    }
}