public async Task When_a_snapshot_is_not_up_to_date_then_GetLatest_retrieves_later_events_and_applies_them()
{
// arrange
var snapshotRepository = new InMemorySnapshotRepository();
Configuration.Current.UseDependency <ISnapshotRepository>(_ => snapshotRepository);
var customerAccount = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
var repository = CreateRepository <CustomerAccount>();
await repository.Save(customerAccount);
var snapshot = customerAccount.CreateSnapshot();
Console.WriteLine(snapshot.Body);
await snapshotRepository.SaveSnapshot(snapshot);
await SaveEventsDirectly(new CustomerAccount.RequestedSpam
{
AggregateId = snapshot.AggregateId,
SequenceNumber = 124
}.ToInMemoryStoredEvent());
// act
var account = await repository.GetLatest(snapshot.AggregateId);
// assert
account.Version.Should().Be(124);
account.NoSpam.Should().Be(false);
}
public void When_instantiated_from_a_snapshot_the_aggregate_version_is_correct()
{
// arrange
var customerAccount = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
customerAccount.ConfirmSave();
var snapshot = customerAccount.CreateSnapshot();
snapshot.Version = 12;
// act
var accountFromSnapshot = new CustomerAccount(snapshot);
// assert
accountFromSnapshot.Version.Should().Be(12);
}
public void EventSourcedAggregate_can_be_rehydrated_from_an_empty_event_sequence_when_using_a_snapshot()
{
// arrange
var emailAddress = Any.Email();
var customerAccount = new CustomerAccount()
.Apply(new ChangeEmailAddress(emailAddress));
customerAccount.ConfirmSave();
var snapshot = customerAccount.CreateSnapshot();
//act
var fromSnapshot = new CustomerAccount(snapshot);
// assert
fromSnapshot.EmailAddress
.Should()
.Be(emailAddress);
}
public void An_aggregate_instantiated_from_a_snapshot_adds_new_events_at_the_correct_sequence_number()
{
// arrange
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
account.ConfirmSave();
var snapshot = account.CreateSnapshot();
snapshot.Version = 12;
// act
var accountFromSnapshot = new CustomerAccount(snapshot);
accountFromSnapshot.Apply(new RequestNoSpam());
// assert
accountFromSnapshot.Version.Should().Be(13);
accountFromSnapshot.PendingEvents.Last().SequenceNumber.Should().Be(13);
}
public void Accessing_event_history_from_an_aggregate_instantiated_using_a_snapshot_throws()
{
// arrange
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
account.ConfirmSave();
var snapshot = account
.CreateSnapshot();
snapshot.Version = 10;
account = new CustomerAccount(snapshot);
// act
Action getEvents = () => account.Events();
// assert
getEvents.ShouldThrow <InvalidOperationException>()
.And
.Message
.Should()
.Contain("Aggregate was sourced from a snapshot, so event history is unavailable.");
}
public void Attempting_to_re_source_an_aggregate_that_was_instantiated_using_a_snapshot_succeeds_if_the_specified_version_is_at_or_after_the_snapshot()
{
// arrange
var originalEmail = Any.Email();
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(originalEmail));
account.ConfirmSave();
var snapshot = account.CreateSnapshot();
snapshot.Version = 10;
account = new CustomerAccount(snapshot);
account.Apply(new ChangeEmailAddress(Any.Email()));
// act
var accountAtVersion10 = account.AsOfVersion(10);
// arrange
accountAtVersion10.Version.Should().Be(10);
accountAtVersion10.EmailAddress.Should().Be(originalEmail);
}
public void Attempting_to_re_source_an_aggregate_that_was_instantiated_using_a_snapshot_throws_if_the_specified_version_is_prior_to_the_snapshot()
{
// arrange
var account = new CustomerAccount()
.Apply(new ChangeEmailAddress(Any.Email()));
account.ConfirmSave();
var snapshot = account
.CreateSnapshot();
snapshot.Version = 10;
account = new CustomerAccount(snapshot);
// act
Action rollBack = () => account.AsOfVersion(9);
// assert
rollBack.ShouldThrow <InvalidOperationException>()
.And
.Message
.Should()
.Contain("Snapshot version is later than specified version.");
}
