MirBSD manpage: Test::Builder::Tester(3p)

Test::Builder::TePerl(Programmers RefereTest::Builder::Tester(3p)


     Test::Builder::Tester - test testsuites that have been built
     with Test::Builder


         use Test::Builder::Tester tests => 1;
         use Test::More;

         test_out("not ok 1 - foo");
         test_test("fail works");


     A module that helps you test testing modules that are built
     with Test::Builder.

     The testing system is designed to be used by performing a
     three step process for each test you wish to test.  This
     process starts with using "test_out" and "test_err" in
     advance to declare what the testsuite you are testing will
     output with Test::Builder to stdout and stderr.

     You then can run the test(s) from your test suite that call
     Test::Builder.  At this point the output of Test::Builder is
     safely captured by Test::Builder::Tester rather than being
     interpreted as real test output.

     The final stage is to call "test_test" that will simply com-
     pare what you predeclared to what Test::Builder actually
     outputted, and report the results back with a "ok" or "not
     ok" (with debugging) to the normal output.


     These are the six methods that are exported as default.

         Procedures for predeclaring the output that your test
         suite is expected to produce until "test_test" is
         called.  These procedures automatically assume that each
         line terminates with "\n".  So

            test_out("ok 1","ok 2");

         is the same as

            test_out("ok 1\nok 2");

         which is even the same as

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            test_out("ok 1");
            test_out("ok 2");

         Once "test_out" or "test_err" (or "test_fail" or
         "test_diag") have been called once all further output
         from Test::Builder will be captured by
         Test::Builder::Tester.  This means that your will not be
         able perform further tests to the normal output in the
         normal way until you call "test_test" (well, unless you
         manually meddle with the output filehandles)

         Because the standard failure message that Test::Builder
         produces whenever a test fails will be a common
         occurrence in your test error output, and because has
         changed between Test::Builder versions, rather than
         forcing you to call "test_err" with the string all the
         time like so

             test_err("# Failed test ($0 at line ".line_num(+1).")");

         "test_fail" exists as a convenience method that can be
         called instead.  It takes one argument, the offset from
         the current line that the line that causes the fail is


         This means that the example in the synopsis could be
         rewritten more simply as:

            test_out("not ok 1 - foo");
            test_test("fail works");

         As most of the remaining expected output to the error
         stream will be created by Test::Builder's "diag" func-
         tion, Test::Builder::Tester provides a convience func-
         tion "test_diag" that you can use instead of "test_err".

         The "test_diag" function prepends comment hashes and
         spacing to the start and newlines to the end of the
         expected output passed to it and adds it to the list of
         expected error output.  So, instead of writing

            test_err("# Couldn't open file");

         you can write

            test_diag("Couldn't open file");

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         Remember that Test::Builder's diag function will not add
         newlines to the end of output and test_diag will. So to


         You would do


         without the newlines.

         Actually performs the output check testing the tests,
         comparing the data (with "eq") that we have captured
         from Test::Builder against that that was declared with
         "test_out" and "test_err".

         This takes name/value pairs that effect how the test is

         title (synonym 'name', 'label')
             The name of the test that will be displayed after
             the "ok" or "not ok".

             Setting this to a true value will cause the test to
             ignore if the output sent by the test to the output
             stream does not match that declared with "test_out".

             Setting this to a true value will cause the test to
             ignore if the output sent by the test to the error
             stream does not match that declared with "test_err".

         As a convience, if only one argument is passed then this
         argument is assumed to be the name of the test (as in
         the above examples.)

         Once "test_test" has been run test output will be
         redirected back to the original filehandles that
         Test::Builder was connected to (probably STDOUT and
         STDERR,) meaning any further tests you run will function
         normally and cause success/errors for Test::Harness.

         A utility function that returns the line number that the
         function was called on.  You can pass it an offset which
         will be added to the result.  This is very useful for
         working out the correct text of diagnostic methods that
         contain line numbers.

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         Essentially this is the same as the "__LINE__" macro,
         but the "line_num(+3)" idiom is arguably nicer.

     In addition to the six exported functions there there exists
     one function that can only be accessed with a fully quali-
     fied function call.

         When "test_test" is called and the output that your
         tests generate does not match that which you declared,
         "test_test" will print out debug information showing the
         two conflicting versions.  As this output itself is
         debug information it can be confusing which part of the
         output is from "test_test" and which was the original
         output from your original tests.  Also, it may be hard
         to spot things like extraneous whitespace at the end of
         lines that may cause your test to fail even though the
         output looks similar.

         To assist you, if you have the Term::ANSIColor module
         installed (which you should do by default from perl
         5.005 onwards), "test_test" can colour the background of
         the debug information to disambiguate the different
         types of output. The debug output will have it's back-
         ground coloured green and red.  The green part
         represents the text which is the same between the exe-
         cuted and actual output, the red shows which part

         The "color" function determines if colouring should
         occur or not. Passing it a true or false value will
         enable or disable colouring respectively, and the func-
         tion called with no argument will return the current

         To enable colouring from the command line, you can use
         the Text::Builder::Tester::Color module like so:

            perl -Mlib=Text::Builder::Tester::Color test.t

         Or by including the Test::Builder::Tester::Color module
         directly in the PERL5LIB.


     Calls Test::Builder's "no_ending" method turning off the
     ending tests.  This is needed as otherwise it will trip out
     because we've run more tests than we strictly should have
     and it'll register any failures we had that we were testing
     for as real failures.

     The color function doesn't work unless Term::ANSIColor is
     installed and is compatible with your terminal.

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     Bugs (and requests for new features) can be reported to the
     author though the CPAN RT system:


     Copyright Mark Fowler <mark@twoshortplanks.com> 2002, 2004.

     Some code taken from Test::More and Test::Catch, written by
     by Michael G Schwern <schwern@pobox.com>.  Hence, those
     parts Copyright Micheal G Schwern 2001.  Used and distri-
     buted with permission.

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


     This code has been tested explicitly on the following ver-
     sions of perl: 5.7.3, 5.6.1, 5.6.0, 5.005_03, 5.004_05 and

     Thanks to Richard Clamp <richardc@unixbeard.net> for letting
     me use his testing system to try this module out on.


     Test::Builder, Test::Builder::Tester::Color, Test::More.

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