Re: [TFUI] Dialogs and EventHandlers

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.
>
>  Anthony

Hi Anthony,

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())

Other than that, your point of extracting to a collaborator class is
very good. And it has the extra benefits of being more testable itself
and being reusable.

I've heard it said that the code should treat UI elements as if it
were calling the human API. Each time we suspend and await human
interaction (as in the case of the forn dialog here,) we are actually
just calling the human library function (getFontFromHuman().) Creating
seams around these various steps makes them easier to automate w/o
having to resort to a UI robot tester.

Ed


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