public void CanGetHomeChangeDates()
{
HomeState stateHolder = new HomeState();
DateTime date = new DateTime(2015, 01, 01);
const string roomName = "bedroom";
const string furnitureName = "sofa";
stateHolder.CreateFurniture(furnitureName, roomName, date);
var dates = stateHolder.GetHomeChangeDates();
Assert.IsNotNull(dates);
Assert.AreEqual(1, dates.Count);
Assert.AreEqual(date, dates.First());
DateTime anotherDate = new DateTime(2015, 01, 02);
stateHolder.CreateFurniture(furnitureName, roomName, anotherDate);
dates = stateHolder.GetHomeChangeDates();
Assert.IsNotNull(dates);
Assert.AreEqual(2, dates.Count);
Assert.IsTrue(dates.Contains(date));
Assert.IsTrue(dates.Contains(anotherDate));
}