then
Define that we don't expect any events 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
expected
The event we expect to be returned from the Decider.handle method as a result of handling the _whenCommand using the _givenEvents past events