public void SetProperties_IndividualProperties_UpdateDataAndNotifyObservers()
{
// Setup
const int numberOfChangedProperties = 2;
var mockRepository = new MockRepository();
var observer = mockRepository.StrictMock <IObserver>();
observer.Expect(o => o.UpdateObserver()).Repeat.Times(numberOfChangedProperties);
mockRepository.ReplayAll();
var backgroundData = new BackgroundData(new TestBackgroundDataConfiguration());
backgroundData.Attach(observer);
var properties = new BackgroundDataProperties(backgroundData);
var random = new Random(123);
bool newVisibility = random.NextBoolean();
RoundedDouble newTransparency = random.NextRoundedDouble();
// Call
properties.IsVisible = newVisibility;
properties.Transparency = newTransparency;
// Assert
Assert.AreEqual(newTransparency, properties.Transparency, properties.Transparency.GetAccuracy());
Assert.AreEqual(newVisibility, properties.IsVisible);
mockRepository.VerifyAll();
}