public void Reset_ResetAndEventRaised()
{
TestDataManager dm = new TestDataManager();
TestDataType data = new TestDataType();
dm.Add(data);
TestDataObserver obs = new TestDataObserver();
using IDisposable unsubscriber = dm.Subscribe(obs);
dm.Reset();
Assert.IsFalse(dm.GetAll().Any());
Assert.AreEqual(0, obs.CompleteCount);
Assert.AreEqual(0, obs.Errors.Count);
Assert.AreEqual(1, obs.Next.Count);
DataChanged <TestDataType> change = obs.Next.Dequeue();
Assert.IsTrue(change.Action == DataChangedAction.Reset && change.OldItems?.FirstOrDefault() == data);
}