How to test Publish() method on sagas

[thaifurforo]

I am using the Publish() method on sagas, but I am not sure how to write a unit test that verifies the method is being called. My goal is to ensure that if someone removes it from the code, the unit test will fail.

My suggestion is to expose the _unpublishedCommands list in AggregateSaga through a public property, similar to how the _uncommittedEvents field is exposed in AggregateRoot.

For example:

public IEnumerable<IUncommittedEvent> UnpublishedCommands => _unpublishedCommands;

Would this be a good solution, or is there a specific reason why this property should remain private?
If keeping it private is intentional, is there another recommended way to unit test that Publish() is being called?

[rasmus]

Sorry for the late reply ❤️

AggregateSaga.Publish already has coverage through AggregateSagaTests and SagaAggregateStoreTests, which capture the behavior you’re after. They raise the domain event that calls Publish(...), then verify that the mocked ICommandBus.PublishAsync is hit when PublishAsync runs. If you mirror that pattern in your own saga tests, drive the saga, call PublishAsync, and assert on the bus mock, your test will fail as soon as someone removes the Publish(...) line. Exposing _unpublishedCommands would leak an implementation detail and make future refactors painful, whereas exercising the public PublishAsync API keeps the test black-box and resilient.