Test::Regression - Test library that can be run in two modes; one to generate outputs and a second to

       Some documentation improvements have been suggested by toolic (http://perlmonks.org/?node_id=622051).
       Thanks to Filip Graliński for pointing out I need to test against output of zero length and providing a
       patch.
       Thanks to Christian Walde for pestering me about newline Windows compatibility issues and for providing a
       patch.

       Nicholas Bamber, "<nicholas at periapt.co.uk>"

       Please report any bugs or feature requests to "bug-test-regression at rt.cpan.org", or through the web
       interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Regression>.  I will be notified, and
       then you'll automatically be notified of progress on your bug as I make changes.

   testingofSTDERR
       The testing of stderr from this module is not as thorough as I would like.  Test::Builder::Tester allows
       turning off of stderr checking but not matching by regular expression. Handcrafted efforts currently fall
       foul of Test::Harness. Still it is I believe adequately tested in terms of coverage.

       Copyright 2009-10 Nicholas Bamber.

       This  program  is  free software; you can redistribute it and/or modify it under the terms of either: the
       GNU General Public License as published by the Free Software Foundation; or the Artistic License.

       See http://dev.perl.org/licenses/ for more information.

perl v5.38.2                                       2024-03-08                              Test::Regression(3pm)

       Using the various Test:: modules you can compare the output of a function against what you expect.
       However if the output is complex and changes from version to version, maintenance of the expected output
       could be costly. This module allows one to use the test code to generate the expected output, so that if
       the differences with model output are expected, one can easily refresh the model output.

TEST_REGRESSION_GEN
       If the TEST_REGRESSION_GEN environment file is unset or false in a perl sense, then the named output
       files must exist and be readable and the test will run normally comparing the outputs of the CODE refs
       against the contents of those files. If the environment variable is true in a perl sense, then model
       output files will be overwritten with the output of the CODE ref.

       ok_regression

ok_regression
       This function requires two arguments: a CODE ref and a file path. The CODE ref is expected to return a
       SCALAR string which can be compared against previous runs. If the TEST_REGRESSION_GEN is set to a true
       value, then the CODE ref is run and the output written to the file. Otherwise the output of the file is
       compared against the contents of the file.  There is a third optional argument which is the test name.

       Test::Regression - Test library that can be run in two modes; one to generate outputs and a second to
       compare against them

       You can find documentation for this module with the perldoc command.

           perldoc Test::Regression

       You can also look for information at:

       •   RT: CPAN's request tracker

           <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Test-Regression>

       •   AnnoCPAN: Annotated CPAN documentation

           <http://annocpan.org/dist/Test-Regression>

       •   CPAN Ratings

           <http://cpanratings.perl.org/d/Test-Regression>

       •   Search CPAN

           <http://search.cpan.org/dist/Test-Regression/>

         use Test::Regression;

         ok_regression(sub {return "hello world"}, "t/out/hello_world.txt");

       Version 0.08