public void CallMusicPlayerChangeVolumeWhenVolumePropertyIsSetted()
{
const int volume = 20;
VolumeViewModel viewModel = new VolumeViewModel {Volume = volume};
MockMusicPlayer.Verify(mp => mp.ChangeVolume(volume), Times.Once());
Assert.AreEqual(volume, viewModel.Volume);
}
public void InstantiateCorrectly()
{
VolumeViewModel viewModel = new VolumeViewModel();
Assert.AreEqual(1, viewModel.Volume);
}