pest/tests/Fixtures/Tia/app/app/Calculator.php

<?php

declare(strict_types=1);

namespace Fixture\App;

final class Calculator
{
    public function add(int $a, int $b): int
    {
        return $a + $b;
    }

    public function subtract(int $a, int $b): int
    {
        return $a - $b;
    }
}