then
Define the expected event outcome when GivenWhenThenScenario is calling the Decider.handle with the command provided in when_ and past events provided in given
This step is also known as the Assert step in Arrange, Act, Assert
Return
this GivenWhenThenScenario instance
Parameters
actual
A Consumer that will receive the actual event that resulted from handling handling the _whenCommand using the _givenEvents past events. This Consumer is expected to manually assert the content of the actual event