task::weaken(3) [centos man page]

Task::Weaken(3) 					User Contributed Perl Documentation					   Task::Weaken(3)

NAME

       Task::Weaken - Ensure that a platform has weaken support

DESCRIPTION

       One recurring problem in modules that use Scalar::Util's "weaken" function is that it is not present in the pure-perl variant.

       While this isn't necesarily always a problem in a straight CPAN-based Perl environment, some operating system distributions only include
       the pure-Perl versions, don't include the XS version, and so weaken is then "missing" from the platform, despite passing a dependency on
       Scalar::Util successfully.

       Most notably this is RedHat Linux at time of writing, but other come and go and do the same thing, hence "recurring problem".

       The normal solution is to manually write tests in each distribution to ensure that "weaken" is available.

       This restores the functionality testing to a dependency you do once in your Makefile.PL, rather than something you have to write extra
       tests for each time you write a module.

       It should also help make the package auto-generators for the various operating systems play more nicely, because it introduces a dependency
       that they have to have a proper weaken in order to work.

   How this Task works
       Part of the problem seems to stem from the fact that some distributions continue to include modules even if they fail some of their tests.

       To get around that for this module, it will do a few dirty tricks.

       If Scalar::Util is not available at all, it will issue a normal dependency on the module. However, if Scalar::Util is relatively new ( it
       is >= 1.19 ) and the module does not have weaken, the install will bail out altogether with a long error encouraging the user to seek
       support from their vendor (this problem happens most often in vendor-packaged Perl versions).

       This distribution also contains tests to ensure that weaken is available using more normal methods.

       So if your module uses "weaken", you can just add the following to your Module::Install-based Makefile.PL (or equivalent).

	 requires 'Task::Weaken' => 0;

SUPPORT

       Bugs should be always be reported via the CPAN bug tracker at

       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Task-Weaken>

       For other issues,contact the author.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

SEE ALSO

       Task, Scalar::Util, <http://ali.as/>

COPYRIGHT

       Copyright 2006 - 2011 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.16.3							    2011-03-08							   Task::Weaken(3)

Test::NeedsDisplay(3pm) 				User Contributed Perl Documentation				   Test::NeedsDisplay(3pm)

NAME

       Test::NeedsDisplay - Ensure that tests needing a display have one

SYNOPSIS

       In your Makefile.PL...

	 use inc::Module::Install;
	 # ... or whatever else you use

	 # Check for a display
	 use Test::NeedsDisplay;

	 # ... your Makefile.PL content as normal

       And again in each test script that loads Wx

	 #!/usr/bin/perl

	 use strict;

	 use Test::NeedsDisplay;

	 # Test content as normal...

DESCRIPTION

       When testing GUI applications, sometimes applications or modules absolutely insist on a display, even just to load a module without
       actually showing any objects.

       Regardless, this makes GUI applications pretty much impossible to build and test on headless or automated systems. And it fails to the
       point of not even running the Makefile.PL script because a dependency needs a display so it can be loaded to find a version.

       In these situations, what is needed is a fake display.

       The "Test::NeedsDisplay" module will search around and try to find a way to load some sort of display that can be used for the testing.

   Strategies for Finding a Display
       At this time, only a single method is used (and a very simple one).

       Debian Linux has a script called "xvfb-run" which is a wrapper for the "xvfb", a virtual X server which uses the linux frame buffer.

       When loaded without a viable display, the module will re-exec the same script using something like (for example) "xvfb-run test.t".

       As such, it should be loaded as early as possible, before anything has a chance to change script parameters. These params will be resent
       through to the script again.

METHODS

       There are no methods. You simply use the module as early as possible, probably right after "use strict;" and make sure to load it with only
       default params.

       Specifically, need must always load it before you set the test plan, otherwise the test script will report two plans, and the harness will
       complain about it and die.

	 # Use it like this ...
	 use Test::NeedsDisplay;

	 # ... not like this ...
	 use Test::NeedsDisplay 'anything';

	 # ... and not like this.
	 use Test::NeedsDisplay ();

       And that's all there is to do. The module will take care of the rest.

TO DO

       - Find alternative ways to launch a display on different platforms

SUPPORT

       Bugs should be reported via the CPAN bug tracker at

       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-NeedsDisplay>

       For other issues, contact the author.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

COPYRIGHT

       Copyright 2005 - 2009 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.10.0							    2009-01-04						   Test::NeedsDisplay(3pm)