<?php

namespace App\Tests;

use App\Kernel;
use PHPUnit\Framework\TestCase;

final class KernelCacheTest extends TestCase
{
    public function testAnUpdateKeepsTheRunningCacheAndSelectsANewOneForTheNextRequest(): void
    {
        $root = sys_get_temp_dir().'/kant-cache-'.bin2hex(random_bytes(6));
        mkdir($root);
        $kernel = static fn (): Kernel => new class($root) extends Kernel {
            public function __construct(private string $root)
            {
                parent::__construct('prod', false);
            }

            public function getProjectDir(): string
            {
                return $this->root;
            }
        };
        try {
            file_put_contents($root.'/VERSION', "1.10.1\n");
            $running = $kernel();
            $old = $running->getCacheDir();
            self::assertSame($old, $kernel()->getCacheDir());
            file_put_contents($root.'/VERSION', "1.10.2\n");
            self::assertSame($old, $running->getCacheDir(), 'The active request retains its cache even after VERSION changes.');
            self::assertNotSame($old, $kernel()->getCacheDir(), 'A new kernel must not reuse the previous compiled container or Twig templates.');
        } finally {
            unlink($root.'/VERSION');
            rmdir($root);
        }
    }
}