MassTransit ITestingHarness and OutBoxPattern

[kamilbaczek]

Issue Description:

Problem:

The MassTransit library provides the ITestingHarness interface, which allows for testing and verification of published events. However, when the OutBoxPattern is configured, the behavior of publishing events changes. Instead of immediately publishing the event, the service sends the event in the background after loading it from the database.

Manual Testing:

Manually testing the scenario has confirmed that this behavior is functioning correctly.

Test To Fix