tonlager/tests/Adapter/SongScannerTest.php

<?php

namespace App\Tests\Adapter;

use App\Adapter\ScannedSong;
use App\Adapter\SongScanner;
use PHPUnit\Framework\TestCase;
use function Lambdish\Phunctional\map;

class SongScannerTest extends TestCase
{

    function testDefaultBehaviourFunctional() {
        $scanner = new SongScanner(__DIR__);
        $songs = $scanner->scan();

        $this->assertCount(5, $songs);

        $combinations = map(fn(ScannedSong $song) => [$song->artist, $song->album, $song->title], $songs);
        $this->assertContains(['Band A', 'Album A', 'Song 1'], $combinations);
        $this->assertContains(['Band A', 'Album A', 'Song 2'], $combinations);
        $this->assertContains(['Band A', 'Album B', 'Song 1'], $combinations);
        $this->assertContains(['Band B', 'Album A', 'Song 1'], $combinations);
    }
}