This test exercises the APIs exposed to the session shell:
Create, start, stop, delete stories.
See existing stories as long as they are not deleted.
Add modules to existing stories.
Be notified when story state changes.
Be notified through SessionShell.AttachView() of a new story view when story start is requested by RequestStart().
Be notified through SessionShell.DetachView() of a story going away.
StoryRunner tolerates a session shell not responding fast enough to SessionShell.DetachView().
On logout, no DetachView() calls are made for still running stories.
The test code is invoked as a session shell from basemgr and executes a predefined sequence of steps, rather than to expose a UI to be driven by user interaction, as a session shell normally would. I.e. the test is implemented as a session shell component.
