koel/tests/Feature/ScrobbleTest.php

<?php

namespace Tests\Feature;

use App\Models\Song;
use App\Models\User;
use App\Services\LastfmService;
use Exception;

class ScrobbleTest extends TestCase
{
    /**
     * @throws Exception
     */
    public function testLastfmScrobble()
    {
        $this->withoutEvents();
        $this->createSampleMediaSet();

        $song = Song::first();
        /** @var User $user */
        $user = factory(User::class)->create();
        $user->setPreference('lastfm_session_key', 'foo');

        $ts = time();

        $this->mockIocDependency(LastfmService::class)
            ->shouldReceive('scrobble')
            ->with($song->album->artist->name, $song->title, $ts, $song->album->name, 'foo')
            ->once();

        $this->postAsUser("/api/{$song->id}/scrobble/$ts", [], $user)
            ->assertResponseOk();
    }
}