public void ApplyingNoEvents_GivenNewAggregateObject_ShouldNotModifyState()
{
// Arrange
var user = new User();
// Act
user.ApplyAll(Enumerable.Empty<object>());
// Assert
AssertAreJsonEqual((Guid?)null, user.BaseVersion);
}
public void ApplyingEventsThatHaveBaseType_GivenAnyAggregateObject_ShouldCallAppropriateApplyMethodForEachTypeInEventTypeHierarchy()
{
// Arrange
var user = new User();
var events = new object[] { new UserRegistered(user.Id), new UserChangedPassword("newpassword"), new UserChangedPassword("newerpassword") };
// Act
user.ApplyAll(events);
// Assert
Assert.AreEqual(3, user.ChangeCount);
}
public void GivenAggregateWithUncommittedEvents_WhenSaving_ThenUncommittedEventsShouldBeAccepted()
{
// Arrange
var user = new User();
user.Register();
var repository = new EventSourcingRepository<User>(new InMemoryEventStore(), new Mock<IConcurrencyMonitor>().Object);
// Act
repository.Save(user);
// Assert
CollectionAssert.IsEmpty(user.GetUncommittedEvents());
}
public void ApplyingPreviouslyGeneratedEvents_GivenNewAggregateObject_ShouldBringAggregateBackToPreviousState()
{
// Arrange
var user = new User();
user.Register();
var events = new object[] {new UserRegistered(user.Id), new UserChangedPassword("newpassword"), new UserChangedPassword("newerpassword") };
// Act
user.ApplyAll(events);
// Assert
Assert.Throws<InvalidOperationException>(() => user.ChangePassword("newerpassword"), "Expected exception stating the new password must be different the the previous one, indicating that previous events have replayed successfully.");
}
public void ApplyingPreviousEvents_GivenEventsThatWouldNotSatisfyCurrentInvariantLogic_ShouldNotFail()
{
// Arrange
var userId = Guid.Parse("{42B90234-926D-4AA6-A960-F610D52F8F88}");
var user = new User();
var events = new object[] {new UserRegistered(userId), new UserChangedPassword("newpassword"), new UserChangedPassword("newpassword") };
// Act
user.ApplyAll(events);
// Assert
Assert.Throws<InvalidOperationException>(() => user.ChangePassword("newpassword"), "Expected exception stating the new password must be different the the previous one, indicating that previous events have replayed successfully.");
}
public void GivenAggregateWithNoUncommittedEvents_WhenSaved_ThenEventStoreShouldContainNoAdditionalEvents()
{
// Arrange
var eventStore = new InMemoryEventStore();
var repository = new EventSourcingRepository<User>(eventStore, new Mock<IConcurrencyMonitor>().Object);
var user = new User();
var expectedEvents = Enumerable.Empty<object>();
// Act
repository.Save(user);
// Assert
CollectionAssertAreJsonEqual(expectedEvents, eventStore.Events);
}
public void GivenEmptyEventStore_WhenAddingEventsInBulk_ThenStoreShouldContainThoseEvents()
{
// Arrange
IEventStore store = new InMemoryEventStore();
var user = new User();
user.Register();
user.ChangePassword("newpassword");
// Act
store.Store(user.Id, user.GetUncommittedEvents());
// Assert
CollectionAssert.IsNotEmpty(((InMemoryEventStore)store).Events);
CollectionAssert.AreEqual(user.GetUncommittedEvents(), ((InMemoryEventStore)store).Events);
}
public void GivenAggregateWithUncommittedEvents_WhenSaved_ThenEventStoreShouldContainThoseEvents()
{
// Arrange
var eventStore = new InMemoryEventStore();
IRepository<User> repository = new EventSourcingRepository<User>(eventStore, new Mock<IConcurrencyMonitor>().Object);
var user = new User();
user.Register();
var expectedEvents = new object[] { new UserRegistered(user.Id) };
// Act
repository.Save(user);
// Assert
CollectionAssertAreJsonEqual(expectedEvents, eventStore.Events);
}
public void AcceptingEvents_GivenAggregateWithUncommittedEvents_ShouldClearUncommittedEvents()
{
// Arrange
var user = new User();
user.Register();
user.ChangePassword("newpassword");
// Act
var userRegisteredEvent = new UserRegistered(user.Id);
var userChangedPasswordEvent = new UserChangedPassword("newpassword") { ParentVersion = userRegisteredEvent.Version };
IEnumerable<object> expectedBefore = new object[] { userRegisteredEvent, userChangedPasswordEvent };
IEnumerable<object> expectedAfter = new object[0];
IEnumerable<object> before = user.GetUncommittedEvents();
user.AcceptUncommittedEvents();
IEnumerable<object> after = user.GetUncommittedEvents();
// Assert
CollectionAssertAreJsonEqual(expectedBefore, before);
CollectionAssertAreJsonEqual(expectedAfter, after);
}
public void GivenEventStorePopulatedWithEventsForMultipleAggregates_WhenLoadingEventsForAnAggregate_ThenShouldReturnEventsForThatAggregate()
{
// Arrange
IEventStore store = new InMemoryEventStore();
var user1 = new User();
user1.Register();
user1.ChangePassword("user1pwd1");
user1.ChangePassword("user1pwd2");
var user2 = new User();
user2.Register();
user2.ChangePassword("user2pwd1");
user2.ChangePassword("user2pwd2");
store.Store(user1.Id, user1.GetUncommittedEvents());
store.Store(user2.Id, user2.GetUncommittedEvents());
// Act
IEnumerable<object> eventsForUser1 = store.Load(user1.Id);
// Assert
CollectionAssert.AreEqual(user1.GetUncommittedEvents(), eventsForUser1, "Store didn't return user1's events properly.");
}
public void GivenAnyAggregateRoot_WhenBehaviourIsInvokedAndEventsRaised_ThenBaseVersionShouldNotChange()
{
// Arrange
var user = new User();
user.Register();
var baseVersion = user.BaseVersion;
// Act
user.ChangePassword("newpassword");
// Assert
Assert.AreEqual(baseVersion, user.BaseVersion, "User's base version is not correct.");
}
public void GivenNewAggreateWithNoEvents_WhenSaving_ThenShouldNotBotherCheckingConcurrency()
{
// Arrange
var user = new User();
var concurrencyMonitor = new Mock<IConcurrencyMonitor>();
var repository = new EventSourcingRepository<User>(new InMemoryEventStore(), concurrencyMonitor.Object);
// Act
repository.Save(user);
// Assert
concurrencyMonitor.Verify(monitor => monitor.CheckForConflicts(It.IsAny<IEnumerable<object>>(), It.IsAny<IEnumerable<object>>()), Times.Never());
}
public void InvokingBehaviourThatDoesntSetId_GivenNewObject_ShouldFail()
{
var user = new User();
Assert.Throws<IdNotSetException>(() => user.ChangePassword("newpassword"));
}
public void InvokingBehaviourOnObjectWithNoIdThatDoesntSetTheId_ShouldFail()
{
var user = new User();
var events = new object[] { /*new UserRegistered(user.Id), */new UserChangedPassword("newpassword"), new UserChangedPassword("newpassword") };
user.ApplyAll(events);
Assert.Throws<IdNotSetException>(() => user.ChangePassword("newnewpassword"));
}
public void InvokingBehaviour_GivenSimpleAggregateRoot_ShouldRecordEvents()
{
// Arrange
var user = new User();
user.Register();
// Act
user.ChangePassword("newpassword");
IEnumerable<object> actual = user.GetUncommittedEvents();
var userRegisteredEvent = new UserRegistered(user.Id);
var userChangedPasswordEvent = new UserChangedPassword("newpassword") { ParentVersion = userRegisteredEvent.Version };
IEnumerable<object> expected = new object[] { userRegisteredEvent, userChangedPasswordEvent };
// Assert
CollectionAssertAreJsonEqual(expected, actual);
}
public void InvokingBehaviour_GivenAggregateWithInvariantLogic_ShouldFailIfInvariantIsNotSatisfied()
{
// Arrange
var user = new User();
user.Register();
user.ChangePassword("newpassword");
// Act / Assert
Assert.Throws<InvalidOperationException>(() => user.ChangePassword("newpassword"), "Expected exception stating the new password must be different the the previous one.");
}