public void GivenEmptyEventStore_WhenLoadingEvents_ThenNothingShouldBeReturned()
{
// Arrange
IEventStore store = new InMemoryEventStore();
// Act
IEnumerable<object> events = store.Load(Guid.NewGuid());
// Assert
CollectionAssert.IsEmpty(events);
}
public void GivenEmptyEventStore_WhenAddingEventsOneAtATime_ThenStoreShouldContainThoseEvents()
{
// Arrange
IEventStore store = new InMemoryEventStore();
var userId = Guid.NewGuid();
var userRegistered = new UserRegistered(userId);
// Act
store.Store(userId, userRegistered);
// Assert
CollectionAssert.IsNotEmpty(((InMemoryEventStore)store).Events);
Assert.AreSame(userRegistered, ((InMemoryEventStore)store).Events.First());
}
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 GivenAggregateWithUncommittedEvents_WhenSaved_ThenBaseVersionShouldMatchCurrentVersion()
{
// Arrange
var userId = Guid.NewGuid();
var eventStore = new InMemoryEventStore();
var userRegistered = new UserRegistered(userId);
eventStore.Update(userId, userRegistered);
var repository = new EventSourcingRepository<User>(eventStore, new Mock<IConcurrencyMonitor>().Object);
var user = repository.Get(userId);
user.ChangePassword("newpassword");
var currentVersion = user.GetUncommittedEvents().Cast<Event>().Last().Version;
// Act
repository.Save(user);
// Assert
Assert.AreEqual(currentVersion, user.BaseVersion, "User's base version has not been updated to match current version on successful save.");
}
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 GivenPopulatedEventStore_WhenLoadingSpecificVersionOfAggregate_ThenRepositoryShouldRebuildThatAggregateToThatVersion()
{
// Arrange
var eventStore = new InMemoryEventStore();
var userId = Guid.NewGuid();
var events = new object[]
{
new UserRegistered(userId),
new UserChangedPassword("newpassword"),
new UserChangedPassword("newnewpassword")
};
eventStore.Update(userId, events);
var repository = new EventSourcingRepository<User>(eventStore, new Mock<IConcurrencyMonitor>().Object);
// Act
User user = repository.Get(userId, ((Event)events[1]).Version);
// Assert
Assert.AreEqual(((Event)events[1]).Version, user.BaseVersion);
}
public void GivenPopulatedEventStore_WhenLoadingAggregate_ThenRepositoryShouldRebuildThatAggregate()
{
// Arrange
var eventStore = new InMemoryEventStore();
var userId = Guid.NewGuid();
eventStore.Update(
userId,
new object[]
{
new UserRegistered(userId),
new UserChangedPassword("newpassword"),
new UserChangedPassword("newnewpassword")
});
var repository = new EventSourcingRepository<User>(eventStore, new Mock<IConcurrencyMonitor>().Object);
// Act
User user = repository.Get(userId);
// Assert
Assert.Throws<InvalidOperationException>(() => user.ChangePassword("newnewpassword")); // Should fail if the user's events were correctly applied
}
public void GivenPopulatedEventStore_WhenLoadingAggregate_ThenAggregateVersionShouldReflectStoredEvents()
{
// Arrange
var eventStore = new InMemoryEventStore();
var userId = Guid.NewGuid();
var latestVersion = Guid.NewGuid();
eventStore.Update(
userId,
new object[]
{
new UserRegistered(userId),
new UserChangedPassword("newpassword"),
new UserChangedPassword("newnewpassword") { Version = latestVersion }
});
var repository = new EventSourcingRepository<User>(eventStore, new Mock<IConcurrencyMonitor>().Object);
// Act
User user = repository.Get(userId);
// Assert
Assert.AreEqual(latestVersion, user.BaseVersion);
}
public void GivenExistingAggregateWithUnseenChanges_WhenSaving_ThenShouldCheckConcurrencyWithCorrectEvents()
{
// Arrange
var userId = Guid.NewGuid();
var eventStore = new InMemoryEventStore();
eventStore.Update(userId, new UserRegistered(userId));
var concurrencyMonitor = new Mock<IConcurrencyMonitor>();
var repository = new EventSourcingRepository<User>(eventStore, concurrencyMonitor.Object);
var user = repository.Get(userId);
// Now another user changes the password before we get chance to save our changes:
eventStore.Update(userId, new UserChangedPassword("adifferentpassword"));
user.ChangePassword("newpassword");
// Act
repository.Save(user);
// Assert
concurrencyMonitor.Verify(
monitor =>
monitor.CheckForConflicts(
It.Is<IEnumerable<object>>(
unseenEvents => (unseenEvents.Single() as UserChangedPassword).NewPassword == "adifferentpassword"),
It.Is<IEnumerable<object>>(
uncommittedEvents => (uncommittedEvents.Single() as UserChangedPassword).NewPassword == "newpassword")));
}
public void GivenEventStorePopulatedWithManyEventsForAnAggregate_WhenLoadingForSpecificVersion_ThenShouldOnlyLoadEventsUpToAndIncludingThatVersion()
{
// Arrange
IEventStore store = new InMemoryEventStore();
var id = Guid.NewGuid();
var allEvents = new object[]
{
new UserRegistered(id), // v1
new UserChangedPassword("pwd1"), // v2
new UserChangedPassword("pwd2"), // v3
new UserChangedPassword("pwd3"), // v4
new UserChangedPassword("pwd4"), // v5
};
store.Store(id, allEvents);
// Act
IEnumerable<object> version3 = store.Load(id, ((Event)allEvents[2]).Version);
// Assert
CollectionAssert.AreEqual(allEvents.Take(3), version3);
}