Re: Mocking collaborators that are third-party libraries

George -

Answer is clearer and I am reminded of the two (complimentary) approaches.

Thanks.


On Thu, Jul 11, 2013 at 6:17 PM, George Dinwiddie
<[email protected]>wrote:

> **
>
>
> Eb,
>
>
> On 7/11/13 5:35 PM, Eb wrote:
> > Thanks George.
> >
> > I am following that advice also (already) so very good to get affirmation
> > of that.
> >
> > However, I realize my question was not clear enough so continuing from
> your
> > answer, do you always verify behavior on mocked adaptors or are there
> > occasions where you don't? That is, you just mock them but don't verify.
>
> I tend to use a state-based approach (aka "Detroit style") so I'm
> usually verifying the result of the behavior. Often my test doubles are
> simple fakes (data sources) or stubs (data sinks, but usually query-able
> by the test).
>
> When I'm testing with a test-double adapter, I try to be cognizant of
> the assumptions I'm making about the 3rd party system, and write
> integration tests for the real adapter to validate those assumptions.
> This has saved my butt when a new version of the 3rd party system has
> violated my assumptions.
>
>
> > I hope my question is clearer.
>
> And I hope my answer is clearer.
>
> - George
>
>
> >
> > Eb
> >
> >
> > On Thu, Jul 11, 2013 at 4:16 PM, George Dinwiddie
> > <[email protected]>wrote:
> >
> >> **
>
> >>
> >>
> >> Eb,
> >>
> >>
> >> On 7/11/13 2:28 PM, Eb wrote:
> >>> Hi everyone -
> >>>
> >>> What criteria do you use to determine if a collaborator that is a
> >>> third-party should be mocked and the test should verify that the
> >>> collaborator was indeed called when it was supposed to be?
> >>
> >> I wouldn't do that. I use adapters for third-party collaborators and
> >> mock my adapters to verify behavior. I also write integration tests for
> >> the adapter's interaction with the third-party.
> >>
> >> Steve Freeman's advice is to never mock something you don't own. I've
> >> only violated that advice when I needed to simulate error conditions
> >> while testing my adapter.
> >>
> >> - George
>
> --
> Want to speak at AgileDC October 8, 2013? http://agiledc.org/speak/
> ----------------------------------------------------------
> * George Dinwiddie * http://blog.gdinwiddie.com
> Software Development http://www.idiacomputing.com
> Consultant and Coach http://www.agilemaryland.org
> ----------------------------------------------------------
>
>  
>



-- 
blog: http://eikonne.wordpress.com
twitter: @eikonne


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