[PATCH:libXt 1/2 v3] Add test framework similar to xserver and use it to test XtAsprintf

[Gaetan Nadon]

On Mon, 2011-03-14 at 21:47 -0700, Alan Coopersmith wrote:

> I didn't think that was necessary since the macros reported error if
> you had
> unit tests enabled and glib was missing - did I miss something?
> 

The util macros aren't a a copy of the server code. I extracted the
requirements and generalized.

The default for both enable unit test and glib is "auto". Glib can be
used without enable unit test
and unit test can be used without glib. One can have some test cases
that using glib and other that don't.
Because of that staging, libXt can run test cases on a linker that does
not support -wrap, while
the server cannot.

For the "test framework" to be a "framework", it must address the needs
of more than one app
and be forward looking to other possible uses in the future.

I have tried to capture this essence here:


        XORG_ENABLE_UNIT_TESTS will turn on/off unit testing, regardless
        
        of how it is implemented. The default (yes/no) can be specified by each
        module. It can be used by itself if glib or -wrap support is not needed.
        
        XORG_WITH_GLIB will probe the system for glib-2.0. A different version
        can be specified in each module. It will consult XORG_ENABLE_UNIT_TESTS
        but can be used by itself in contexts other then unit testing.
        The default (yes/no) can be specified by each module.
        
        XORG_LD_WRAP will probe the linker for -wrap support. It will consult
        XORG_ENABLE_UNIT_TESTS but can be used by itself in contexts
        other then unit testing.


         --enable-unit-  --with  glib-2.0  glib-2.0  HAVE_GLIB
         tests           -glib  probed    found               
          -----------------------------------------------------------------------------
         auto            auto    yes      yes       yes
         auto            auto    yes      no        no
         auto            yes     yes      yes       yes
         auto            yes     yes      no        no	Error
         auto            no      no       no        no
         yes             auto    yes      yes       yes
         yes             auto    yes      no        no   Error
         yes             yes     yes      yes       yes
         yes             yes     yes      no        no	Error
         yes             no      no       no        no
         no              auto    no       no        no
         no              yes     no       no        no	Error
         no              no      no       no        no
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