private static TestAggregate GetAggregateWithEvents(int numberOfEventsBetweenSnapshots, int numberOfEvents)
{
TestAggregate testAggregate = new TestAggregate(
Guid.NewGuid().ToEventStreamIdFormattedString(),
numberOfEventsBetweenSnapshots);
for (int i = 0; i < numberOfEvents; i++)
{
testAggregate.BusinessLogicThatResultsInEventA("value");
}
return(testAggregate);
}
public async Task Given_No_Uncommitted_Events_For_The_Aggregate_When_Save_Is_Called_Then_An_Error_Is_Raised()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
// Assert
TestAggregate testAggregate = new TestAggregate(eventStreamId);
await AssertExtensions.ThrowsAsync <EventSourcingException>(
async() => await eventStoreDomainRepository.SaveAsync(testAggregate).ConfigureAwait(false)).ConfigureAwait(false);
}
public void Given_An_Event_And_Matching_UpdateState_Method_When_The_Event_Is_Applied_Then_The_Uncommitted_Event_Is_The_Correct_Type()
{
// Arrange
TestAggregate testAggregate = new TestAggregate(Guid.NewGuid().ToEventStreamIdFormattedString());
// Act
testAggregate.BusinessLogicThatResultsInEventA(string.Empty);
// Assert
Assert.NotNull(testAggregate.LastTestMessageA);
Assert.Equal(1, testAggregate.UncommittedEvents.Count);
Assert.Equal(typeof(TestMessageA), testAggregate.UncommittedEvents[0].Body.GetType());
}
public void Given_An_Event_And_Matching_UpdateState_Method_When_The_Event_Is_Raised_Then_The_Correct_UpdateState_Method_Is_Called_On_The_Aggregate()
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
TestAggregate testAggregate = new TestAggregate(eventStreamId);
// Act
testAggregate.BusinessLogicThatResultsInEventA("myValue");
// Assert
Assert.NotNull(testAggregate.LastTestMessageA);
Assert.Equal("myValue", testAggregate.LastTestMessageA.Stuff);
}
public async Task Given_An_Aggregate_With_No_Stream_And_No_Snapshots_When_Loading_From_Latest_Snapshot_Then_The_Aggregate_Should_Be_Empty()
{
// Arrange
IDomainRepository domainRepository = GetDomainRepository();
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
TestAggregate testAggregateToLoad = new TestAggregate(eventStreamId);
// Act
await domainRepository.LoadFromLatestSnapshotIfExistsAsync(testAggregateToLoad).ConfigureAwait(false);
// Assert
Assert.Equal(0, testAggregateToLoad.EventStreamRevision);
}
public async Task Given_An_Invalid_Event_Stream_Id_When_Load_Is_Called_Then_An_Error_Is_Raised()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
TestAggregate testAggregate = new TestAggregate(eventStreamId);
// Act
// Assert
await AssertExtensions.ThrowsAsync <EventStreamNotFoundException>(
async() => await eventStoreDomainRepository.LoadAsync(testAggregate).ConfigureAwait(false)).ConfigureAwait(false);
}
public async Task Given_An_Invalid_Event_Stream_Id_When_The_Exists_Check_Is_Called_Using_The_Aggregate_Reference_Then_The_Aggregate_Should_Report_As_Not_Existing()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
TestAggregate testAggregate = new TestAggregate(eventStreamId);
// Act
bool existsByReference = await eventStoreDomainRepository.ExistsAsync(testAggregate).ConfigureAwait(false);
// Assert
Assert.False(existsByReference);
}
public async Task Given_An_Invalid_Event_Stream_Id_When_LoadIfExists_Is_Called_Then_False_Is_Returned()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
TestAggregate testAggregate = new TestAggregate(eventStreamId);
// Act
bool aggregateLoaded = await eventStoreDomainRepository.LoadIfExistsAsync(testAggregate).ConfigureAwait(false);
// Assert
Assert.False(aggregateLoaded);
}
public void Given_An_Aggregate_When_An_Event_Is_Applied_Then_The_Number_Of_Events_Since_Last_Snapshot_Count_Increases_By_One()
{
// Arrange
TestAggregate testAggregate = new TestAggregate(Guid.NewGuid().ToEventStreamIdFormattedString());
// Act
long countBefore = testAggregate.NumberOfEventsSinceLastSnapshot;
testAggregate.BusinessLogicThatResultsInEventA("value");
// Assert
Assert.Equal(0, countBefore);
Assert.Equal(1, testAggregate.NumberOfEventsSinceLastSnapshot);
}
public void Given_Multiple_Raised_Events_When_The_Aggregate_Is_Not_Saved_Then_StreamRevision_Should_Be_Zero()
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
ITestAggregate aggregate = new TestAggregate(eventStreamId);
// Act
for (int i = 0; i < 10; i++)
{
aggregate.BusinessLogicThatResultsInEventA(string.Empty);
// Assert
Assert.Equal(0, aggregate.EventStreamRevision);
}
}
public async Task Given_An_Aggregate_Which_Has_Not_Been_Saved_When_A_Snapshot_Is_Taken_Then_An_Error_Is_Raised()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
EventStoreDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregateToSave = new TestAggregate(eventStreamId);
testAggregateToSave.BusinessLogicThatResultsInEventA(string.Empty);
// Assert
await AssertExtensions.ThrowsAsync <EventStreamNotFoundException>(
async() => await eventStoreDomainRepository.SaveSnapshotAsync(testAggregateToSave).ConfigureAwait(false)).ConfigureAwait(false);
}
public async Task Given_An_Uncommitted_Event_For_The_Aggregate_When_Save_Is_Called_Then_The_Event_Is_Added_To_The_Event_Store_And_The_EventStreamRevision_And_UncommittedEvents_Are_Updated_On_The_Aggregate()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregate = new TestAggregate(eventStreamId);
testAggregate.BusinessLogicThatResultsInEventA(string.Empty);
await eventStoreDomainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
// Assert
Assert.Equal(0, testAggregate.UncommittedEvents.Count);
Assert.Equal(1, testAggregate.EventStreamRevision);
}
public async Task Given_An_Uncommitted_Event_For_The_Aggregate_When_Save_Is_Called_Then_The_Event_Is_Added_To_The_Event_Store()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregate = new TestAggregate(eventStreamId);
testAggregate.BusinessLogicThatResultsInEventA(string.Empty);
await eventStoreDomainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
IEnumerable <EventStoreMessage> eventStoreMessages = await eventStoreProvider.ReadEventsAsync(eventStreamId).ConfigureAwait(false);
// Assert
Assert.Single(eventStoreMessages);
}
public async Task Given_A_Valid_Event_Stream_Id_When_The_Exists_Check_Is_Called_Using_The_Aggregate_Reference_Then_The_Aggregate_Should_Report_As_Not_Existing()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregateToSave = new TestAggregate(eventStreamId);
testAggregateToSave.BusinessLogicThatResultsInEventA(string.Empty);
await eventStoreDomainRepository.SaveAsync(testAggregateToSave).ConfigureAwait(false);
bool existsByReference = await eventStoreDomainRepository.ExistsAsync(testAggregateToSave).ConfigureAwait(false);
// Assert
Assert.True(existsByReference);
}
public async Task Given_An_Aggregate_With_No_Snapshots_When_Loading_From_Latest_Snapshot_Then_The_Aggregate_Should_Be_Loaded_From_The_Stream()
{
// Arrange
IDomainRepository domainRepository = GetDomainRepository();
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
Guid eventId = Guid.NewGuid();
// Act
TestAggregate testAggregateToSaveAndSnapshot = new TestAggregate(eventStreamId);
testAggregateToSaveAndSnapshot.BusinessLogicThatResultsInEventA("some value 1", eventId);
await domainRepository.SaveAsync(testAggregateToSaveAndSnapshot).ConfigureAwait(false);
TestAggregate testAggregateToLoad = new TestAggregate(eventStreamId);
await domainRepository.LoadFromLatestSnapshotIfExistsAsync(testAggregateToLoad).ConfigureAwait(false);
// Assert
Assert.Equal(1, testAggregateToLoad.EventStreamRevision);
}
public async Task Given_An_Empty_Stream_When_An_Event_Is_Written_To_The_Stream_Through_SaveWithoutConcurrencyCheck_Then_Aggregate_Reflects_The_Correct_Stream_Revision()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
EventStoreDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
Guid eventIdThatWeAreGoingToReUseToCauseAnIdempotentAppend = Guid.NewGuid();
// Act
TestAggregate testAggregateA = new TestAggregate(eventStreamId);
testAggregateA.BusinessLogicThatResultsInEventA("some value 1", eventIdThatWeAreGoingToReUseToCauseAnIdempotentAppend);
await eventStoreDomainRepository.SaveWithoutConcurrencyCheckAsync(testAggregateA).ConfigureAwait(false);
long eventStreamRevisionAfterFirstEvent = testAggregateA.EventStreamRevision;
// Assert
Assert.Equal(1, eventStreamRevisionAfterFirstEvent);
}
public void Given_A_Valid_Snapshot_When_The_Snapshot_Is_Loaded_By_The_Aggregate_Then_The_Aggregate_State_Is_As_Expected()
{
// Arrange
TestAggregate testAggregate = new TestAggregate(Guid.NewGuid().ToEventStreamIdFormattedString());
const string value = "the value";
const int streamRevision = 4;
TestAggregateSnapshot testAggregateSnapshot = new TestAggregateSnapshot(new TestMessageA {
Stuff = value
});
EventStoreSnapshot eventStoreSnapshot = new EventStoreSnapshot(Guid.NewGuid(), streamRevision, testAggregateSnapshot);
// Act
testAggregate.Load(eventStoreSnapshot);
// Assert
Assert.Equal(streamRevision, testAggregate.EventStreamRevision);
Assert.Equal(0, testAggregate.UncommittedEvents.Count);
Assert.Equal(value, testAggregate.LastTestMessageA.Stuff);
}
protected async Task Given_An_Aggregate_Throughout_The_Lifecycle_When_The_Number_Of_Events_Since_Last_Snapshot_Checked_Then_It_Reports_The_Correct_Value(IDomainRepository domainRepository, Func <TestAggregate, Task> loadAggregateAsync)
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregate = new TestAggregate(eventStreamId);
testAggregate.BusinessLogicThatResultsInEventA("value1");
long numberOfEventsSinceLastSnapshotAfterApply = testAggregate.NumberOfEventsSinceLastSnapshot;
await domainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
long numberOfEventsSinceLastSnapshotAfterSave = testAggregate.NumberOfEventsSinceLastSnapshot;
TestAggregate testAggregateLoadedFromStream = new TestAggregate(eventStreamId);
await domainRepository.LoadAsync(testAggregateLoadedFromStream).ConfigureAwait(false);
long numberOfEventsSinceLastSnapshotAfterLoadFromStream = testAggregateLoadedFromStream.NumberOfEventsSinceLastSnapshot;
await domainRepository.SaveSnapshotAsync(testAggregateLoadedFromStream).ConfigureAwait(false);
long numberOfEventsSinceLastSnapshotAfterSnapshot = testAggregateLoadedFromStream.NumberOfEventsSinceLastSnapshot;
TestAggregate testAggregateLoadedFromSnapshot = new TestAggregate(eventStreamId);
await loadAggregateAsync.Invoke(testAggregateLoadedFromSnapshot).ConfigureAwait(false);
long numberOfEventsSinceLastSnapshotAfterLoadFromSnapshot = testAggregateLoadedFromSnapshot.NumberOfEventsSinceLastSnapshot;
testAggregateLoadedFromSnapshot.BusinessLogicThatResultsInEventA("value2");
await domainRepository.SaveAsync(testAggregateLoadedFromSnapshot).ConfigureAwait(false);
TestAggregate testAggregateLoadedFromSnapshotAndSubsequentStreamEvents = new TestAggregate(eventStreamId);
await loadAggregateAsync.Invoke(testAggregateLoadedFromSnapshotAndSubsequentStreamEvents).ConfigureAwait(false);
long numberOfEventsSinceLastSnapshotAfterLoadFromSnapshotAndSubsequentStreamEvents = testAggregateLoadedFromSnapshotAndSubsequentStreamEvents.NumberOfEventsSinceLastSnapshot;
// Assert
Assert.Equal(1, numberOfEventsSinceLastSnapshotAfterApply);
Assert.Equal(1, numberOfEventsSinceLastSnapshotAfterSave);
Assert.Equal(1, numberOfEventsSinceLastSnapshotAfterLoadFromStream);
Assert.Equal(0, numberOfEventsSinceLastSnapshotAfterSnapshot);
Assert.Equal(0, numberOfEventsSinceLastSnapshotAfterLoadFromSnapshot);
Assert.Equal(1, numberOfEventsSinceLastSnapshotAfterLoadFromSnapshotAndSubsequentStreamEvents);
}
public async Task Given_A_Valid_Stream_Of_Events_When_The_Aggregate_Is_Loaded_Then_It_Does_So_Successfully()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
EventStoreMessage eventStoreMessage = new EventStoreMessage(Guid.NewGuid(), new TestMessageA());
eventStoreProvider.AppendEvents(eventStreamId, eventStoreMessage);
await eventStoreProvider.CommitEventsAsync(eventStreamId, ExpectedStreamRevision.New).ConfigureAwait(false);
TestAggregate testAggregate = new TestAggregate(eventStreamId);
await eventStoreDomainRepository.LoadAsync(testAggregate).ConfigureAwait(false);
// Assert
Assert.Equal(eventStreamId, testAggregate.EventStreamId);
Assert.Equal(0, testAggregate.UncommittedEvents.Count);
Assert.Equal(1, testAggregate.EventStreamRevision);
}
public async Task Given_Three_Events_Stored_In_The_Event_Stream_In_A_Single_Operation_When_The_Aggregate_Is_Loaded_Then_The_Aggregate_Revision_Is_Three()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregateToSave = new TestAggregate(eventStreamId);
testAggregateToSave.BusinessLogicThatResultsInEventA(string.Empty);
testAggregateToSave.BusinessLogicThatResultsInEventA(string.Empty);
testAggregateToSave.BusinessLogicThatResultsInEventA(string.Empty);
await eventStoreDomainRepository.SaveAsync(testAggregateToSave).ConfigureAwait(false);
TestAggregate testAggregateToLoad = new TestAggregate(eventStreamId);
await eventStoreDomainRepository.LoadAsync(testAggregateToLoad).ConfigureAwait(false);
// Assert
Assert.Equal(3, testAggregateToLoad.EventStreamRevision);
}
public async Task Given_An_Aggregate_With_Uncommitted_Events_When_The_Aggregate_Is_Saved_Then_Afterwards_The_Aggregate_Can_Be_Loaded_Successfully()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregateToSave = new TestAggregate(eventStreamId);
testAggregateToSave.BusinessLogicThatResultsInEventA(string.Empty);
await eventStoreDomainRepository.SaveAsync(testAggregateToSave).ConfigureAwait(false);
TestAggregate loadedTestAggregate = new TestAggregate(eventStreamId);
await eventStoreDomainRepository.LoadAsync(loadedTestAggregate).ConfigureAwait(false);
// Assert
Assert.Equal(eventStreamId, loadedTestAggregate.EventStreamId);
Assert.Equal(0, loadedTestAggregate.UncommittedEvents.Count);
Assert.Equal(1, loadedTestAggregate.EventStreamRevision);
}
protected async Task Given_An_Aggregate_With_Two_Events_That_Have_The_Same_Id_When_Saving_A_Snapshot_Then_The_Revision_Should_Be_One(IDomainRepository domainRepository, Func <TestAggregate, Task> loadAggregateAsync)
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
Guid eventId = Guid.NewGuid();
// Act
TestAggregate testAggregateToSaveAndSnapshot = new TestAggregate(eventStreamId);
testAggregateToSaveAndSnapshot.BusinessLogicThatResultsInEventA("some value 1", eventId);
testAggregateToSaveAndSnapshot.BusinessLogicThatResultsInEventA("some value 2", eventId);
await domainRepository.SaveAsync(testAggregateToSaveAndSnapshot).ConfigureAwait(false);
await domainRepository.SaveSnapshotAsync(testAggregateToSaveAndSnapshot).ConfigureAwait(false);
TestAggregate testAggregateToLoad = new TestAggregate(eventStreamId);
await loadAggregateAsync.Invoke(testAggregateToLoad).ConfigureAwait(false);
// Assert
Assert.Equal(1, testAggregateToLoad.EventStreamRevision);
}
public async Task Given_An_Aggregate_Containing_Two_Events_With_The_Same_Id_When_The_Aggregate_Is_Saved_Then_Only_One_Event_Should_Written_To_The_Stream_And_A_Subsequent_Save_Of_The_Aggregate_Should_Succeed_Because_The_Stream_Revision_Of_The_Aggregate_Is_Kept_In_Sync()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
EventStoreDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
Guid eventIdA = Guid.NewGuid();
Guid eventIdB = Guid.NewGuid();
// Act
TestAggregate testAggregate = new TestAggregate(eventStreamId);
testAggregate.BusinessLogicThatResultsInEventA("some value 1", eventIdA);
testAggregate.BusinessLogicThatResultsInEventA("some value 2", eventIdA);
await eventStoreDomainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
testAggregate.BusinessLogicThatResultsInEventA("some value 3", eventIdB);
await eventStoreDomainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
// Assert
Assert.Equal(2, testAggregate.EventStreamRevision);
}
protected async Task Given_An_Aggregate_With_Snapshot_And_One_Event_In_The_Stream_Since_The_Snapshot_Then_The_Number_Of_Events_Since_Last_Snapshot_Is_One(IDomainRepository domainRepository, Func <TestAggregate, Task> loadAggregateAsync)
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
TestAggregate testAggregate = new TestAggregate(eventStreamId);
testAggregate.BusinessLogicThatResultsInEventA("value1");
await domainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
await domainRepository.SaveSnapshotAsync(testAggregate).ConfigureAwait(false);
testAggregate.BusinessLogicThatResultsInEventA("value2");
await domainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
TestAggregate testAggregateLoadedFromSnapshot = new TestAggregate(eventStreamId);
await loadAggregateAsync.Invoke(testAggregateLoadedFromSnapshot).ConfigureAwait(false);
// Assert
Assert.Equal(1, testAggregateLoadedFromSnapshot.NumberOfEventsSinceLastSnapshot);
}
public async Task Given_A_Separate_Update_To_The_Event_Stream_When_SaveWithoutConcurrencyCheck_Is_Used_Then_No_Error_Is_Raised()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
// Act
// Create an aggregate with some events and save it.
TestAggregate testAggregateToSave = new TestAggregate(eventStreamId);
testAggregateToSave.BusinessLogicThatResultsInEventA(string.Empty);
await eventStoreDomainRepository.SaveAsync(testAggregateToSave).ConfigureAwait(false);
// Load a new instance of the aggregate and add another event.
TestAggregate loadedTestAggregateA = new TestAggregate(eventStreamId);
await eventStoreDomainRepository.LoadAsync(loadedTestAggregateA).ConfigureAwait(false);
loadedTestAggregateA.BusinessLogicThatResultsInEventA(string.Empty);
// Load another instance of the aggregate, add another event and save it.
TestAggregate loadedTestAggregateB = new TestAggregate(eventStreamId);
await eventStoreDomainRepository.LoadAsync(loadedTestAggregateB).ConfigureAwait(false);
loadedTestAggregateB.BusinessLogicThatResultsInEventA(string.Empty);
await eventStoreDomainRepository.SaveAsync(loadedTestAggregateB).ConfigureAwait(false);
// Save the first aggregate.
await eventStoreDomainRepository.SaveWithoutConcurrencyCheckAsync(loadedTestAggregateA).ConfigureAwait(false);
// Reload the aggregate so we can check it.
TestAggregate testAggregate = new TestAggregate(eventStreamId);
await eventStoreDomainRepository.LoadAsync(testAggregate).ConfigureAwait(false);
// Assert.
// Check that all 3 events have been applied to the aggregate.
Assert.Equal(3, testAggregate.EventStreamRevision);
}
public async Task Given_Events_Stored_For_The_Event_Stream_When_LoadIfExists_Is_Called_Then_True_Is_Returned_And_The_Aggregate_Can_Be_Loaded_Successfully()
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
IDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
eventStoreProvider.AppendEvents(eventStreamId, new EventStoreMessage(Guid.NewGuid(), new TestMessageA()));
await eventStoreProvider.CommitEventsAsync(eventStreamId, ExpectedStreamRevision.New).ConfigureAwait(false);
TestAggregate testAggregate = new TestAggregate(eventStreamId);
// Act
bool aggregateLoaded = await eventStoreDomainRepository.LoadIfExistsAsync(testAggregate).ConfigureAwait(false);
// Assert
Assert.True(aggregateLoaded);
Assert.Equal(eventStreamId, testAggregate.EventStreamId);
Assert.Equal(0, testAggregate.UncommittedEvents.Count);
Assert.Equal(1, testAggregate.EventStreamRevision);
Assert.NotNull(testAggregate.LastTestMessageA);
}
protected async Task Given_An_Aggregate_Which_Has_Been_Saved_When_A_Snapshot_Is_Taken_Then_The_Aggregate_Can_Be_Loaded_From_The_Latest_Snapshot(IDomainRepository domainRepository, Func <TestAggregate, Task> loadAggregateAsync)
{
// Arrange
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
const string testValue = "some value";
// Act
TestAggregate testAggregateToSave = new TestAggregate(eventStreamId);
testAggregateToSave.BusinessLogicThatResultsInEventA(testValue);
await domainRepository.SaveAsync(testAggregateToSave).ConfigureAwait(false);
await domainRepository.SaveSnapshotAsync(testAggregateToSave).ConfigureAwait(false);
TestAggregate testAggregateToLoad = new TestAggregate(eventStreamId);
await loadAggregateAsync.Invoke(testAggregateToLoad).ConfigureAwait(false);
// Assert
Assert.Equal(testAggregateToSave.EventStreamId, testAggregateToLoad.EventStreamId);
Assert.Equal(testAggregateToSave.EventStreamRevision, testAggregateToLoad.EventStreamRevision);
Assert.Equal(testValue, testAggregateToLoad.LastTestMessageA.Stuff);
Assert.Equal(0, testAggregateToLoad.UncommittedEvents.Count);
}
public async Task Given_An_Aggregate_Containing_Two_Events_With_The_Same_Id_When_The_Aggregate_Is_Saved_Then_Only_The_First_Event_Should_Written_To_The_Stream()
{
// Arrange
IEventStoreProvider eventStoreProvider = GetEventStoreProvider();
EventStoreDomainRepository eventStoreDomainRepository = new EventStoreDomainRepository(eventStoreProvider);
string eventStreamId = Guid.NewGuid().ToEventStreamIdFormattedString();
const string expectedValue = "the value we should end up with";
Guid eventId = Guid.NewGuid();
// Act
TestAggregate testAggregate = new TestAggregate(eventStreamId);
testAggregate.BusinessLogicThatResultsInEventA(expectedValue, eventId);
testAggregate.BusinessLogicThatResultsInEventA("some other value", eventId);
await eventStoreDomainRepository.SaveAsync(testAggregate).ConfigureAwait(false);
// Assert
TestAggregate testAggregateThatIsLoaded = new TestAggregate(eventStreamId);
await eventStoreDomainRepository.LoadAsync(testAggregateThatIsLoaded).ConfigureAwait(false);
Assert.Equal(1, testAggregateThatIsLoaded.EventStreamRevision);
Assert.Equal(0, testAggregateThatIsLoaded.UncommittedEvents.Count);
Assert.Equal(expectedValue, testAggregateThatIsLoaded.LastTestMessageA.Stuff);
}
