Mock objects can greatly improve unittests (If used in 
the correct context), especially for code that relis upon 
resource hungry test (connections to databases, socket 
servers etc).

The module/patch (to unittest) which I am submitting 
helps to introspect calls to code whilst maintaing 
transparency and funcionality with your code.

I had previously written a similar module for my present 
employers, and myself and fellow XP partners agree 
that it has made the XP testing cycle consderably 
easier.  Having googol-ed-out alternatives on the web, I 
have not found a solution that provides the same level of 
flexibility. (hope that doesn't sound arrogant)

The tests for this module should highlight usage, but i 
will supply dummy code if this idea is accepted.

If unfamiliar with XP/MockObject ideas, please see :
http://www.xprogramming.com/xpmag/virtualMockObject
s.htm#N78

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This is now in feature request #708125.