RE: How do I unit test a Dispose method ?

Except that B must already be IDisposable. The IDisposable pattern requires that any object that owns an IDisposable must itself implement IDisposable.


*  This is inane, as it requires the owning object to know about implementation details of it's ownee.
I disagree. All that A needs to know is that B implements the IDisposable interface.

  * A has to know about something pertaining to B that has nothing to do with why A needs it.