Re: [TFUI] Dialogs and EventHandlers

Ed Howland <[email protected]> writes:

> On 11/7/05, Anthony Williams
> <anthony_w.geo-/[email protected]> wrote:
>>
>>  I just posted an entry on my blog about this, describing what I would do
>>  differently:
>>
>>  http://www.livejournal.com/users/anthony_w/8000.html
>>
>>  The key difference is that I believe the GetFontFromUserSelection function
>>  does not belong on the MyForm class, so I would extract it to a
>>  collaborator instead of mocking the FontDialog.

> Two points about your approach. I notice your  
> form.menuItem15_Click(null, null); is still private on your MyForm
> class. And you should be able to mock with NMock or the built in
> DynamicMock in NUnit in your test.
>
>   DynamicMock mock = new DynamicMock(typeof(FontSelector);
>
>   MyForm form = new MyForm((FontSelector)mock);
>   mock.ExpectAndReturn("GetFontFromUserSelection", expectedFont, defaultFont);
>   ...
>    form.menuItem15_Click(null, null);
>    mock.Verify()
>    Assert.AreEqual(expectedFont, form.Display.Font);
>
> This has the advantage of not needing another class
> (MockFontSelector.) And you can easily test the wiring across the
> seam, as it were (via Verify())

Absolutely. I left the implementation of MockFontSelector as an exercise for
the reader, since it's not really relevant to the idea. If you generally use a
mocking framework such as NMock, then it would make sense to use it here; if
you generally hand-craft your mocks, then I would suggest you do the same
here.

Anthony
-- 
Anthony Williams
Software Developer
Just Software Solutions Ltd
http://www.justsoftwaresolutions.co.uk



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