How to create unit tests for NServiceBus Saga when Saga has more than one handler

Question

I used to have this test, which passes just fine (The saga is complete once all three messages have been handled.

        Test.Saga<TestSagaHandler>(sagaId)
            .When(x =>
            {
                x.Handle(new TestSagaStartMessageOne
                {
                    Id = sagaId
                });
                x.Handle(new TestSagaStartMessageTwo
                {
                    Id = sagaId
                });
                x.Handle(new TestSagaNonStartingMessage
                {
                    Id = sagaId
                });
            });
            .AssertSagaCompletionIs(true);

I now want to break out the TestSagaNonStartingMessage into its own handler, and did the following:

        Test.Saga<TestSagaHandler>(sagaId)
            .When(x =>
            {
                x.Handle(new TestSagaStartMessageOne
                {
                    Id = sagaId
                });
                x.Handle(new TestSagaStartMessageTwo
                {
                    Id = sagaId
                });
            });

        Test.Saga<TestSagaHandlerSingleMessage>(sagaId)
            .When(x =>
                x.Handle(new TestSagaNonStartingMessage
                {
                    Id = sagaId
                })
            )
        .AssertSagaCompletionIs(true);

However, when handling the TestSagaNonStartingMessage - the saga data is not persisted from the previous handlers.

Am I having persistence problems, or is the test constructed badly?

score 3 · Answer 1 · answered Jun 02 '11 at 21:06

3

The test isn't constructed correctly - please look at the test project in the manufacturing sample to see how it should be structured. The short answer is to chain the second .When(...) after the first.

answered Jun 02 '11 at 21:06

Udi Dahan

11,932
1
27
35

score 1 · Accepted Answer · answered Nov 12 '15 at 15:00

For other readers reference, the proper test structure should be similar to:

    Test.Saga<TestSagaHandler>(sagaId)
        .When(x =>
        {
            x.Handle(new TestSagaStartMessageOne { Id = sagaId });
            x.Handle(new TestSagaStartMessageTwo { Id = sagaId });
        })
        .When(x =>
            x.Handle(new TestSagaNonStartingMessage { Id = sagaId })
        )
        .AssertSagaCompletionIs(true);

As Udi indicated, chain the "When" clauses together.

Also, in order to derive further value from the test, consider introducing exceptions, such as ExpectSend<>, ExpectPublish, etc.

Reference: http://docs.particular.net/nservicebus/testing/

Oh my how obvious that seems to me now 4 years later=) Thanks for the clarification=) — Hugo Forte, Nov 13 '15 at 14:37

How to create unit tests for NServiceBus Saga when Saga has more than one handler

2 Answers2