public void UsedTypesMethodIsReturningCorrectValues()
{
var model = new PhoneNumberEntriesViewModel { };
var totalCount = model.AllTypes().Count;
Assert.AreEqual(model.UsedTypes().Count, 0);
var car = new PhoneNumberEntry { PhoneNumberType = PhoneNumberTypes.Car };
model.Entries.Add(car);
Assert.AreEqual(model.UsedTypes().Count, 1);
Assert.IsTrue(model.UsedTypes().Contains(car.PhoneNumberType));
}
