Simple Smoke test for Symfony applications

DefaultControllerTest.php

<?php
/**
 * Automatically smoke test all your static routes, and all dynamic routes with default values.
 * Adapted and simplified from https://github.com/Pierstoval/SmokeTesting
 * On an idea from Ismail1432 https://github.com/ismail1432 on Twitter:
 * https://twitter.com/SmaineDev/status/1559542937696043008
 */

namespace App\Tests\Controller;

use Symfony\Bundle\FrameworkBundle\KernelBrowser;
use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouterInterface;

class DefaultControllerTest extends WebTestCase
{
    private static KernelBrowser $client;

    public static function setUpBeforeClass(): void
    {
        static::$client = static::createClient();
    }

    /**
     * @dataProvider providePublicUrlsAndStatusCodes
     */
    public function testPublicUrlIsNotServerError(string $method, string $url): void
    {
        static::$client->request($method, $url);

        $this->assertLessThan(500, static::$client->getResponse()->getStatusCode());
    }

    public function providePublicUrlsAndStatusCodes(): \Generator
    {
        $router = static::getContainer()->get(RouterInterface::class);
        $collection = $router->getRouteCollection();
        static::ensureKernelShutdown();

        foreach ($collection as $routeName => $route) {
            /** @var Route $route */
            $variables = $route->compile()->getVariables();
            if (count(array_diff($variables, $route->getDefaults())) > 0) {
                continue;
            }
            if ([] === $methods = $route->getMethods()) {
                $methods[] = 'GET';
            }
            foreach ($methods as $method) {
                $path = $router->generate($routeName);
                yield "$method $path" => [$method, $path];
            }
        }
    }
}