public void WhenDecreaseMinusExistingGoesUnderMin_ThenSetToMin()
{
var sut = new SonosVolume(20);
sut.Decrease(21);
Assert.That(sut.Value, Is.EqualTo(SonosVolume.MinVolume));
}
public void WhenDecrease_ThenSetToExistingMinusDecrease()
{
var sut = new SonosVolume(50);
sut.Decrease(20);
Assert.That(sut.Value, Is.EqualTo(30));
}
public void WhenDecreaseAmountIsLessThanZero_ThenThrowException()
{
var sut = new SonosVolume(50);
Assert.Throws <ArgumentOutOfRangeException>(() => sut.Decrease(-1));
}