public function testTracksInMultimediaObject()
{
$mm = new MultimediaObject();
$track1 = new Track();
$track2 = new Track();
$track3 = new Track();
$this->assertEquals(0, count($mm->getTracks()));
$mm->addTrack($track1);
$mm->addTrack($track2);
$mm->addTrack($track3);
$this->assertEquals(3, count($mm->getTracks()));
$tracksArray = array($track1, $track2, $track3);
$this->assertEquals($tracksArray, $mm->getTracks()->toArray());
$mm->removeTrack($track2);
$this->assertEquals(2, count($mm->getTracks()));
$this->assertTrue($mm->containsTrack($track1));
$this->assertFalse($mm->containsTrack($track2));
$tracksArray = array(0 => $track1, 2 => $track3);
$this->assertEquals($tracksArray, $mm->getTracks()->toArray());
}