[Laravel] Use `Hash::setRounds(4)` in CreatesApplication trait to speed up your tests

CreatesApplication.php

<?php

/*
    People are seeing test speeds improve by 15-55%.
    Results will vary depending on how much user seeding and hasing your tests are doing.
    Now included in laravel/laravel by default: https://github.com/laravel/laravel/pull/4517
*/

namespace Tests;

use Illuminate\Support\Facades\Hash;
use Illuminate\Contracts\Console\Kernel;

trait CreatesApplication
{
    /**
     * Creates the application.
     *
     * @return \Illuminate\Foundation\Application
     */
    public function createApplication()
    {
        $app = require __DIR__.'/../bootstrap/app.php';

        $app->make(Kernel::class)->bootstrap();

        Hash::setRounds(5);

        return $app;
    }
}