Re: Reviving name of target being tested in error messages

Philippe Fremy sez:
> Hi,
>
> in the first version of cppunit, IIRC, one could write something like that
> :
>
> CPPUNIT_ASSERT_EQUALS( a, 2 )
>
> and get an error message like
>
> " 'a' was expected to be 2 but was actually 3"
>
> Now the error message is more along
>
> " expected: 2
>   but was: 3
> "
>
> There is a loss of information, the name of what was being tested. And I
> like to have it back.
>
> Was it removed because getting a string for this argument was dependant on
> a macro trick ?

Just to fan some flames here, but that's not a macro "trick", it's a very 
healthy established practice called "Stringerization". There's no reason not 
to do it. I have often gone to great lengths to reproduce the trick in 
interpretive languages.

This CppUnit knock-off uses it (and puts it in the Output window of VC++):

	http://c2.com/cgi/wiki?VisualCeePlusPlus

    #define CPPUNIT_SQUEAK(q)                    {  std::ostringstream z;     
            z << __FILE__ << '(' << __LINE__ << ") : Failed; " << q << '\n';  
                cout << z.str() << std::flush;                         
::OutputDebugString?(z.str().c_str());                   worked = false;  }


    #define CPPUNIT_ASSERT_EQUAL(alpha, omega)                            if 
((alpha) != (omega))                                       
CPPUNIT_SQUEAK(#alpha " != " #omega << "; " << alpha << " != " << omega)

Observe those lines output in "file(#): message" format, meaning VC++ will 
navigate to the line that failed the test on an <F4>.

Putting the \ back on the lines is left as an exercize for the user.

I'm not sure if CppUnit has these features either. My minimal implementation 
turns VC++ into the test window, and permits very easy round-trip navigation.



-- 
  Phlip
   http://www.greencheese.org/EvolutionaryPsychology
  --  I'l have my Web site call your Web site...  --


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