@Test
void shouldAddSeveralFilesNameToTheList() {

    soundManager.add("music/mvmt0.wav");
    soundManager.add("music/hand_sound1.mp3");
    soundManager.add("music/song.mp3");
    Assertions.assertTrue(soundManager.getListOfMusicToPlay().contains("music/mvmt0.wav"));
    Assertions.assertTrue(soundManager.getListOfMusicToPlay().contains("music/hand_sound1.mp3"));
    Assertions.assertTrue(soundManager.getListOfMusicToPlay().contains("music/song.mp3"));
}