@Test
void shouldUnmuteVolumeWhenUnmuteButtonPressed() {

    mockVolumeSlider.setValue(0);
    StackPane result = (StackPane) musicControl.createMuteSwitchButton(mockVolumeSlider);
    Button unmute = (Button) result.getChildren().get(1);
    unmute.fire();
    assertNotEquals(0, mockVolumeSlider.getValue());
}