It appears to be a code smell when a mock returns a mock. See hints of why from this thread: http://programmers.stackexchange.com/questions/232442/unit-testing-factories-and-the-law-of-demeter which point to here which shows how application of LoD quickly fixes the problem.
Misko Hevery says the mocked item, e.g. the factory, should actually be returning a "newable" -- the exception being when returning third party objects such as java.io.File. See response to Tom at http://misko.hevery.com/your-suggestions/
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