public async Task It_should_successfully_update_the_saga()
{
var id = Guid.NewGuid();
var sagaData = new SagaWithoutUniquePropertyData
{
Id = id,
NonUniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
// first session
var session = new InMemorySynchronizedStorageSession();
await persister.Save(sagaData, SagaCorrelationProperty.None, session, new ContextBag());
await session.CompleteAsync();
// second session
var session2 = new InMemorySynchronizedStorageSession();
var ctx = new ContextBag();
var saga = await persister.Get<SagaWithoutUniquePropertyData>(id, session2, ctx);
saga.NonUniqueString = "asdfasdf";
await persister.Update(saga, session2, ctx);
await session2.CompleteAsync();
var result = await persister.Get<SagaWithoutUniquePropertyData>(sagaData.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.That(result, Is.Not.Null);
Assert.That(result.NonUniqueString, Is.EqualTo("asdfasdf"));
}
public async Task Save_fails_when_data_changes_between_read_and_update_on_same_thread()
{
var sagaId = Guid.NewGuid();
var saga = new TestSagaData
{
Id = sagaId,
SomeId = sagaId.ToString()
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata<TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var winningContext = new ContextBag();
var record = await persister.Get<TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), winningContext);
var losingContext = new ContextBag();
var staleRecord = await persister.Get<TestSagaData>("SomeId", sagaId.ToString(), new InMemorySynchronizedStorageSession(), losingContext);
var winningSaveSession = new InMemorySynchronizedStorageSession();
var losingSaveSession = new InMemorySynchronizedStorageSession();
await persister.Update(record, winningSaveSession, winningContext);
await persister.Update(staleRecord, losingSaveSession, losingContext);
await winningSaveSession.CompleteAsync();
Assert.That(async () => await losingSaveSession.CompleteAsync(), Throws.InstanceOf<Exception>().And.Message.StartsWith($"InMemorySagaPersister concurrency violation: saga entity Id[{saga.Id}] already saved."));
}
public async Task It_should_successfully_remove_the_saga()
{
var id = Guid.NewGuid();
var sagaData = new SagaWithoutUniquePropertyData
{
Id = id,
NonUniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
var savingSession = new InMemorySynchronizedStorageSession();
await persister.Save(sagaData, null, savingSession, new ContextBag());
await savingSession.CompleteAsync();
// second session
var completingSession = new InMemorySynchronizedStorageSession();
var completingContextBag = new ContextBag();
var saga = await persister.Get<SagaWithoutUniquePropertyData>(id, completingSession, completingContextBag);
await persister.Complete(saga, completingSession, completingContextBag);
await completingSession.CompleteAsync();
var result = await persister.Get<SagaWithoutUniquePropertyData>(sagaData.Id, savingSession, new ContextBag());
Assert.That(result, Is.Null);
}
async Task SaveSaga(SagaWithUniquePropertyData saga)
{
using (var session = new InMemorySynchronizedStorageSession())
{
var ctx = new ContextBag();
await persister.Save(saga, SagaMetadataHelper.GetMetadata<SagaWithUniqueProperty>(saga), session, ctx);
await session.CompleteAsync();
}
}
async Task CompleteSaga(Guid sagaId)
{
using (var session = new InMemorySynchronizedStorageSession())
{
var ctx = new ContextBag();
var saga = await persister.Get<SagaWithUniquePropertyData>(sagaId, session, ctx);
await persister.Complete(saga, session, ctx);
await session.CompleteAsync();
}
}
public async Task Should_return_default_when_using_finding_saga_with_id_of_another_type()
{
var id = Guid.NewGuid();
var simpleSagaEntity = new SimpleSagaEntity
{
Id = id,
OrderSource = "CA"
};
var persister = new InMemorySagaPersister();
var session = new InMemorySynchronizedStorageSession();
await persister.Save(simpleSagaEntity, SagaMetadataHelper.GetMetadata<SimpleSagaEntitySaga>(simpleSagaEntity), session, new ContextBag());
await session.CompleteAsync();
var anotherSagaEntity = await persister.Get<AnotherSimpleSagaEntity>(id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.IsNull(anotherSagaEntity);
}
public async Task Persister_returns_different_instance_of_saga_data()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata<TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var returnedSaga1 = await persister.Get<TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
var returnedSaga2 = await persister.Get<TestSagaData>("Id", saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.AreNotSame(returnedSaga2, returnedSaga1);
Assert.AreNotSame(returnedSaga1, saga);
Assert.AreNotSame(returnedSaga2, saga);
}
public async Task Should_return_default_when_using_finding_saga_with_id_of_another_type()
{
var id = Guid.NewGuid();
var simpleSagaEntity = new SimpleSagaEntity
{
Id = id,
OrderSource = "CA"
};
var persister = new InMemorySagaPersister();
var session = new InMemorySynchronizedStorageSession();
await persister.Save(simpleSagaEntity, SagaMetadataHelper.GetMetadata <SimpleSagaEntitySaga>(simpleSagaEntity), session, new ContextBag());
await session.CompleteAsync();
var anotherSagaEntity = await persister.Get <AnotherSimpleSagaEntity>(id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.IsNull(anotherSagaEntity);
}
public async Task It_should_persist_successfully()
{
var saga1 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var saga2 = new AnotherSagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
var transaction = new InMemorySynchronizedStorageSession();
await persister.Save(saga1, SagaMetadataHelper.GetMetadata<SagaWithUniqueProperty>(saga1), transaction, new ContextBag());
await persister.Save(saga2, SagaMetadataHelper.GetMetadata<AnotherSagaTwoUniqueProperty>(saga2), transaction, new ContextBag());
await transaction.CompleteAsync();
}
public async Task It_should_persist_successfully()
{
var saga1 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var saga2 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
using (var session1 = new InMemorySynchronizedStorageSession())
{
await persister.Save(saga1, SagaMetadataHelper.GetMetadata <SagaWithUniqueProperty>(saga1), session1, new ContextBag());
await persister.Complete(saga1, session1, new ContextBag());
await session1.CompleteAsync();
}
using (var session2 = new InMemorySynchronizedStorageSession())
{
await persister.Save(saga2, SagaMetadataHelper.GetMetadata <SagaWithUniqueProperty>(saga2), session2, new ContextBag());
await persister.Complete(saga2, session2, new ContextBag());
await session2.CompleteAsync();
}
using (var session3 = new InMemorySynchronizedStorageSession())
{
await persister.Save(saga1, SagaMetadataHelper.GetMetadata <SagaWithUniqueProperty>(saga1), session3, new ContextBag());
await persister.Complete(saga1, session3, new ContextBag());
await session3.CompleteAsync();
}
}
public async Task Save_fails_when_data_changes_between_concurrent_instances()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new InMemorySagaPersister();
var storageAdapter = new InMemoryTransactionalSynchronizedStorageAdapter();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata <TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
Assert.That(async() =>
{
using (var tx = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
{
Transaction.Current.EnlistDurable(EnlistmentWhichEnforcesDtcEscalation.Id, new EnlistmentWhichEnforcesDtcEscalation(), EnlistmentOptions.None);
var transportTransaction = new TransportTransaction();
transportTransaction.Set(Transaction.Current);
var unenlistedSession = new InMemorySynchronizedStorageSession();
var enlistedSession = await storageAdapter.TryAdapt(transportTransaction, new ContextBag());
var unenlistedSessionContext = new ContextBag();
var unenlistedRecord = await persister.Get <TestSagaData>(saga.Id, unenlistedSession, unenlistedSessionContext);
var enlistedSessionContext = new ContextBag();
var enlistedRecord = await persister.Get <TestSagaData>("Id", saga.Id, enlistedSession, enlistedSessionContext);
await persister.Update(unenlistedRecord, unenlistedSession, unenlistedSessionContext);
await persister.Update(enlistedRecord, enlistedSession, enlistedSessionContext);
await unenlistedSession.CompleteAsync();
tx.Complete();
}
}, Throws.Exception.TypeOf <TransactionAbortedException>());
}
public async Task Save_process_is_repeatable()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata <TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var returnedSaga1 = await Task.Run(() => persister.Get <TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag()));
var returnedSaga2 = await persister.Get <TestSagaData>("Id", saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
var winningSaveSession = new InMemorySynchronizedStorageSession();
var losingSaveSession = new InMemorySynchronizedStorageSession();
await persister.Save(returnedSaga1, SagaMetadataHelper.GetMetadata <TestSaga>(saga), winningSaveSession, new ContextBag());
await persister.Save(returnedSaga2, SagaMetadataHelper.GetMetadata <TestSaga>(saga), losingSaveSession, new ContextBag());
await winningSaveSession.CompleteAsync();
Assert.That(async() => await losingSaveSession.CompleteAsync(), Throws.InstanceOf <Exception>().And.Message.StartsWith($"InMemorySagaPersister concurrency violation: saga entity Id[{saga.Id}] already saved."));
var returnedSaga3 = await Task.Run(() => persister.Get <TestSagaData>("Id", saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag()));
var returnedSaga4 = await persister.Get <TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
winningSaveSession = new InMemorySynchronizedStorageSession();
losingSaveSession = new InMemorySynchronizedStorageSession();
await persister.Save(returnedSaga4, SagaMetadataHelper.GetMetadata <TestSaga>(saga), winningSaveSession, new ContextBag());
await persister.Save(returnedSaga3, SagaMetadataHelper.GetMetadata <TestSaga>(saga), losingSaveSession, new ContextBag());
await winningSaveSession.CompleteAsync();
Assert.That(async() => await losingSaveSession.CompleteAsync(), Throws.InstanceOf <Exception>().And.Message.StartsWith($"InMemorySagaPersister concurrency violation: saga entity Id[{saga.Id}] already saved."));
}
public async Task It_should_persist_successfully()
{
var saga1 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga1, SagaMetadataHelper.GetMetadata<SagaWithUniqueProperty>(saga1), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var updatingContext = new ContextBag();
saga1 = await persister.Get<SagaWithUniquePropertyData>(saga1.Id, new InMemorySynchronizedStorageSession(), updatingContext);
var updateSession = new InMemorySynchronizedStorageSession();
await persister.Update(saga1, updateSession, updatingContext);
await updateSession.CompleteAsync();
}
public async Task Persister_returns_different_instance_of_saga_data()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata <TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var returnedSaga1 = await persister.Get <TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
var returnedSaga2 = await persister.Get <TestSagaData>("Id", saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.AreNotSame(returnedSaga2, returnedSaga1);
Assert.AreNotSame(returnedSaga1, saga);
Assert.AreNotSame(returnedSaga2, saga);
}
public async Task Save_fails_when_data_changes_between_concurrent_instances()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new InMemorySagaPersister();
var storageAdapter = new InMemoryTransactionalSynchronizedStorageAdapter();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata<TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
Assert.That(async () =>
{
using (var tx = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
{
Transaction.Current.EnlistDurable(EnlistmentWhichEnforcesDtcEscalation.Id, new EnlistmentWhichEnforcesDtcEscalation(), EnlistmentOptions.None);
var transportTransaction = new TransportTransaction();
transportTransaction.Set(Transaction.Current);
var unenlistedSession = new InMemorySynchronizedStorageSession();
var enlistedSession = await storageAdapter.TryAdapt(transportTransaction, new ContextBag());
var unenlistedSessionContext = new ContextBag();
var unenlistedRecord = await persister.Get<TestSagaData>(saga.Id, unenlistedSession, unenlistedSessionContext);
var enlistedSessionContext = new ContextBag();
var enlistedRecord = await persister.Get<TestSagaData>("Id", saga.Id, enlistedSession, enlistedSessionContext);
await persister.Update(unenlistedRecord, unenlistedSession, unenlistedSessionContext);
await persister.Update(enlistedRecord, enlistedSession, enlistedSessionContext);
await unenlistedSession.CompleteAsync();
tx.Complete();
}
}, Throws.Exception.TypeOf<TransactionAbortedException>());
}
public async Task Should_delete_the_saga()
{
var saga = new SagaWithUniquePropertyData { Id = Guid.NewGuid(), UniqueString = "whatever" };
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga,SagaMetadataHelper.GetMetadata<SagaWithUniqueProperty>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var intentionallySharedContext = new ContextBag();
var sagaData = await persister.Get<SagaWithUniquePropertyData>(saga.Id, new InMemorySynchronizedStorageSession(), intentionallySharedContext );
var completeSession = new InMemorySynchronizedStorageSession();
await persister.Complete(saga, completeSession, intentionallySharedContext );
await completeSession.CompleteAsync();
var completedSagaData = await persister.Get<SagaWithUniquePropertyData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.NotNull(sagaData);
Assert.Null(completedSagaData);
}
public async Task It_should_persist_successfully()
{
var saga1 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga1, SagaMetadataHelper.GetMetadata <SagaWithUniqueProperty>(saga1), insertSession, new ContextBag());
await insertSession.CompleteAsync();
saga1 = await persister.Get <SagaWithUniquePropertyData>(saga1.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
var updateSession = new InMemorySynchronizedStorageSession();
await persister.Update(saga1, updateSession, new ContextBag());
await updateSession.CompleteAsync();
}
public async Task It_should_persist_successfully()
{
var saga1 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var saga2 = new AnotherSagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
var transaction = new InMemorySynchronizedStorageSession();
await persister.Save(saga1, SagaMetadataHelper.GetMetadata <SagaWithUniqueProperty>(saga1), transaction, new ContextBag());
await persister.Save(saga2, SagaMetadataHelper.GetMetadata <AnotherSagaTwoUniqueProperty>(saga2), transaction, new ContextBag());
await transaction.CompleteAsync();
}
public async Task It_should_persist_successfully()
{
var sagaData = new SagaWithoutUniquePropertyData
{
Id = Guid.NewGuid(),
NonUniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
using (var session = new InMemorySynchronizedStorageSession())
{
await persister.Save(sagaData, null, session, new ContextBag());
await session.CompleteAsync();
}
using (var session = new InMemorySynchronizedStorageSession())
{
var retrieved = await persister.Get<SagaWithoutUniquePropertyData>(sagaData.Id, session, new ContextBag());
Assert.AreEqual(sagaData.NonUniqueString, retrieved.NonUniqueString);
}
}
public async Task Should_delete_the_saga()
{
var saga = new SagaWithUniquePropertyData {
Id = Guid.NewGuid(), UniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata <SagaWithUniqueProperty>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var sagaData = await persister.Get <SagaWithUniquePropertyData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
var completeSession = new InMemorySynchronizedStorageSession();
await persister.Complete(saga, completeSession, new ContextBag());
await completeSession.CompleteAsync();
var completedSagaData = await persister.Get <SagaWithUniquePropertyData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.NotNull(sagaData);
Assert.Null(completedSagaData);
}
public async Task Should_delete_the_saga()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata <TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var sagaData = await persister.Get <TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
var deleteSession = new InMemorySynchronizedStorageSession();
await persister.Complete(saga, deleteSession, new ContextBag());
await deleteSession.CompleteAsync();
var completedSaga = await persister.Get <TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), new ContextBag());
Assert.NotNull(sagaData);
Assert.Null(completedSaga);
}
public async Task It_should_enforce_uniqueness()
{
var saga1 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var saga2 = new SagaWithUniquePropertyData
{
Id = Guid.NewGuid(),
UniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
var winningSession = new InMemorySynchronizedStorageSession();
var losingSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga1, SagaMetadataHelper.GetMetadata<SagaWithUniqueProperty>(saga1), winningSession, new ContextBag());
await persister.Save(saga2, SagaMetadataHelper.GetMetadata<SagaWithUniqueProperty>(saga1), losingSession, new ContextBag());
await winningSession.CompleteAsync();
Assert.That(async () => await losingSession.CompleteAsync(), Throws.InstanceOf<InvalidOperationException>());
}
public async Task It_should_persist_successfully()
{
var sagaData = new SagaWithoutUniquePropertyData
{
Id = Guid.NewGuid(),
NonUniqueString = "whatever"
};
var persister = new InMemorySagaPersister();
using (var session = new InMemorySynchronizedStorageSession())
{
await persister.Save(sagaData, null, session, new ContextBag());
await session.CompleteAsync();
}
using (var session = new InMemorySynchronizedStorageSession())
{
var retrieved = await persister.Get <SagaWithoutUniquePropertyData>(sagaData.Id, session, new ContextBag());
Assert.AreEqual(sagaData.NonUniqueString, retrieved.NonUniqueString);
}
}
public async Task Save_process_is_repeatable()
{
var sagaId = Guid.NewGuid();
var saga = new TestSagaData
{
Id = sagaId,
SomeId = sagaId.ToString()
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata<TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var winningSessionContext = new ContextBag();
var returnedSaga1 = await Task.Run(() => persister.Get<TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), winningSessionContext));
var losingSessionContext = new ContextBag();
var returnedSaga2 = await persister.Get<TestSagaData>("SomeId", sagaId.ToString(), new InMemorySynchronizedStorageSession(), losingSessionContext);
var winningSaveSession = new InMemorySynchronizedStorageSession();
var losingSaveSession = new InMemorySynchronizedStorageSession();
await persister.Update(returnedSaga1, winningSaveSession, winningSessionContext);
await persister.Update(returnedSaga2, losingSaveSession, losingSessionContext);
await winningSaveSession.CompleteAsync();
Assert.That(async () => await losingSaveSession.CompleteAsync(), Throws.InstanceOf<Exception>().And.Message.StartsWith($"InMemorySagaPersister concurrency violation: saga entity Id[{saga.Id}] already saved."));
losingSessionContext = new ContextBag();
var returnedSaga3 = await Task.Run(() => persister.Get<TestSagaData>("SomeId", sagaId.ToString(), new InMemorySynchronizedStorageSession(), losingSessionContext));
winningSessionContext = new ContextBag();
var returnedSaga4 = await persister.Get<TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), winningSessionContext);
winningSaveSession = new InMemorySynchronizedStorageSession();
losingSaveSession = new InMemorySynchronizedStorageSession();
await persister.Update(returnedSaga4, winningSaveSession, winningSessionContext);
await persister.Update(returnedSaga3, losingSaveSession, losingSessionContext);
await winningSaveSession.CompleteAsync();
Assert.That(async () => await losingSaveSession.CompleteAsync(), Throws.InstanceOf<Exception>().And.Message.StartsWith($"InMemorySagaPersister concurrency violation: saga entity Id[{saga.Id}] already saved."));
}
public async Task Save_fails_when_writing_same_data_twice()
{
var saga = new TestSagaData
{
Id = Guid.NewGuid()
};
var persister = new InMemorySagaPersister();
var insertSession = new InMemorySynchronizedStorageSession();
await persister.Save(saga, SagaMetadataHelper.GetMetadata<TestSaga>(saga), insertSession, new ContextBag());
await insertSession.CompleteAsync();
var retrievingContext = new ContextBag();
var returnedSaga1 = await persister.Get<TestSagaData>(saga.Id, new InMemorySynchronizedStorageSession(), retrievingContext);
var winningSaveSession = new InMemorySynchronizedStorageSession();
var losingSaveSession = new InMemorySynchronizedStorageSession();
await persister.Update(returnedSaga1, winningSaveSession, retrievingContext);
await persister.Update(returnedSaga1, losingSaveSession, retrievingContext);
await winningSaveSession.CompleteAsync();
Assert.That(async () => await losingSaveSession.CompleteAsync(), Throws.InstanceOf<Exception>().And.Message.StartsWith($"InMemorySagaPersister concurrency violation: saga entity Id[{saga.Id}] already saved."));
}