[TIP] [python] Re: Mock Testing Patterns

Michael Foord fuzzyman at voidspace.org.uk
Mon Nov 19 10:01:15 PST 2007

Gary Bernhardt wrote:
> On Nov 18, 2007 7:27 PM, Michael Foord <fuzzyman at voidspace.org.uk> wrote:
>> Do any of the mocking libraries support this pattern - asserting what
>> methods were called afterwards rather than setting expectations ahead of
>> the actions?
> MiniMock does, if you use it with doctests.  MiniMock is super simple
> - it just prints out every method call to the mock objects.  You don't
> have to set up expectations ahead of time, although you do have to
> tell it what the mocked functions should return (otherwise the code
> under test wouldn't be fooled!)  If you use it in a doctest, the
> printed method calls will have to match what appears in the doctest.
> So the "verification" step just falls out for free - it just becomes
> another part of the doctest's expected output.
Yes - I just looked at minimock. :-)

It is perilously close to what we what we need, but aimed mainly at doctest.

As is the way with Python, rolling your own is very easy. I've created a 
mock class (< 50 LOC) that meets about 90% of our needs. I'll post it soon.


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