public void GivenExistingAggregateWithUnseenChanges_WhenSaving_ThenShouldCheckConcurrencyWithCorrectEvents()
{
// Arrange
var eventStore = new InMemoryEventStore(new ConsoleLogger());
// Register and save a new user
var user = new User();
user.Register();
var concurrencyMonitor = new StrictConcurrencyMonitor();
var repository = new EventSourcingRepository <User>(eventStore, concurrencyMonitor, _logger);
repository.Save(user);
var userVersion = user.Version;
// We change password...
var repository1 = new EventSourcingRepository <User>(eventStore, concurrencyMonitor, _logger);
var user1 = repository1.Get(user.Id, userVersion);
user1.ChangePassword("newpassword");
// ...but so does someone else, who saves their changes before we have a chance to save ours...
var repository2 = new EventSourcingRepository <User>(eventStore, concurrencyMonitor, _logger);
var user2 = repository.Get(user.Id, userVersion);
user2.ChangePassword("newpassword");
repository2.Save(user2);
// ...so we should get a concurrency exception when we try to save
Assert.Throws <ConcurrencyConflictsDetectedException>(() => repository1.Save(user1));
}
public void GivenUnseenEventsAndNoUncommittedEvents_WhenTestingForConflicts_ThenFindNoConflicts()
{
// Arrange
IConcurrencyMonitor monitor = new StrictConcurrencyMonitor();
IEnumerable <object> unseenEvents = new[] { new UserRegistered(Guid.NewGuid()) };
IEnumerable <object> uncommittedEvents = Enumerable.Empty <object>();
// Act
IEnumerable <ConcurrencyConflict> conflicts = monitor.CheckForConflicts(unseenEvents, uncommittedEvents);
// Assert
CollectionAssert.IsEmpty(conflicts, "Conflicts have been returned where there should be none.");
}
public void GivenUnseenEvents_WhenTestingForConflicts_ThenFindConflicts()
{
// Arrange
var userId = Guid.NewGuid();
IConcurrencyMonitor monitor = new StrictConcurrencyMonitor();
IEnumerable <object> unseenEvents = new[] { new UserChangedPassword("newpassword") };
IEnumerable <object> uncommittedEvents = new[] { new UserChangedPassword("differentnewpassword") };
// Act
IList <ConcurrencyConflict> conflicts = monitor.CheckForConflicts(unseenEvents, uncommittedEvents).ToList();
// Assert
Assert.AreEqual(1, conflicts.Count, "Expected one and only one conflict.");
var conflict = conflicts.Single();
CollectionAssert.AreEqual(unseenEvents, conflict.UnseenEvents);
CollectionAssert.AreEqual(uncommittedEvents, conflict.UncommittedEvents);
Assert.AreEqual("Changes conflict with one or more committed events.", conflict.Message);
}
