Re: TDD:ing MFC

Paula S. wrote:

> I know some people are successfully doing TDD with VC++ MFC. I'm currently 
> trying to add unit tests to a legacy MFC application and need some help to 
> get started testing dialogs and windows. Some pointers in the right 
> direction would be much appreciated.

MFC has major architectural flaws that resist clean testing. One good policy 
is to use "in vivo" testing, per the book /Working Effictively with Legacy 
Code/ by Mike Feathers. That means you start the application's main work 
loop, and after the main window has painted you encounter a line of code 
like this:

#ifdef DEBUG
      runTests(mainHwnd);
#end

That means when you run your program from VC++, in Debug mode it will invoke 
a test rig, and pass in a handle to the main window. The tests now operate 
on the window, treating all its subwindows and controls as objects.

I would use UnitTest++ for the test rig. It's designed to be lean and 
non-invasive (unlike MFC), so you'll easily squeeze it into the runTests() 
function.

Ask about any more questions!

-- 
  Phlip
  http://www.oreilly.com/catalog/9780596510657/
  "Test Driven Ajax (on Rails)"
  assert_xpath, assert_javascript, & assert_ajax



 
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