public void Can_LIFO_When_History_N_Plus2()
{
var careTaker = new HastingsCareTaker();
var subbedMemento1 = Substitute.For <IHastingsMemento>();
subbedMemento1.Peer.Returns(PeerIdHelper.GetPeerId("step1"));
careTaker.Add(subbedMemento1);
var subbedMemento2 = Substitute.For <IHastingsMemento>();
subbedMemento2.Peer.Returns(PeerIdHelper.GetPeerId("step2"));
careTaker.Add(subbedMemento2);
var subbedMemento3 = Substitute.For <IHastingsMemento>();
subbedMemento3.Peer.Returns(PeerIdHelper.GetPeerId("step3"));
careTaker.Add(subbedMemento3);
var lastState1 = careTaker.Get();
lastState1.Should().Be(subbedMemento3);
careTaker.HastingMementoList.Count.Should().Be(2);
careTaker.HastingMementoList.First().Should().Be(subbedMemento2);
var lastState2 = careTaker.Get();
lastState2.Should().Be(subbedMemento2);
careTaker.HastingMementoList.Count.Should().Be(1);
careTaker.HastingMementoList.First().Should().Be(subbedMemento1);
}
public void Can_Never_Take_Last_State_From_CareTaker()
{
var careTaker = new HastingsCareTaker();
var subbedMemento = Substitute.For <IHastingsMemento>();
careTaker.Add(subbedMemento);
careTaker.Get();
careTaker.HastingMementoList.Count.Should().Be(1);
}
public void Care_Taker_Can_Get_Last_State()
{
var careTaker = new HastingsCareTaker();
var subbedMemento = Substitute.For <IHastingsMemento>();
careTaker.Add(subbedMemento);
careTaker.Add(subbedMemento);
careTaker.HastingMementoList.Should().HaveCount(2);
var previousState = careTaker.Get();
previousState.Should().BeSameAs(subbedMemento);
careTaker.HastingMementoList.Should().HaveCount(1);
}
public void Taking_From_Memento_List_Takes_LIFO()
{
var careTaker = new HastingsCareTaker();
var stack = new Stack <IHastingsMemento>();
stack.Push(DiscoveryHelper.SubMemento(_ownNode));
var history = DiscoveryHelper.MockMementoHistory(stack);
history.ToList().ForEach(m => careTaker.Add(m));
careTaker.Get().Should().Be(history.Last());
careTaker.HastingMementoList.First().Should().Be(history.First());
careTaker.HastingMementoList.Count.Should().Be(history.Count - 1);
}
public void Care_Taker_Should_Throw_Exception_Trying_To_Take_Last_State_From_Empty_CareTaker()
{
var careTaker = new HastingsCareTaker();
Assert.Throws <InvalidOperationException>(() => { careTaker.Get(); });
}