Test::Output(3) 					User Contributed Perl Documentation					   Test::Output(3)

NAME

       Test::Output - Utilities to test STDOUT and STDERR messages.

VERSION

       Version 0.16

SYNOPSIS

	   use Test::More tests => 4;
	   use Test::Output;

	   sub writer {
	     print "Write out.
";
	     print STDERR "Error out.
";
	   }

	   stdout_is(&writer,"Write out.
",'Test STDOUT');

	   stderr_isnt(&writer,"No error out.
",'Test STDERR');

	   combined_is(
		       &writer,
		       "Write out.
Error out.
",
		       'Test STDOUT & STDERR combined'
		      );

	   output_is(
		     &writer,
		     "Write out.
",
		     "Error out.
",
		     'Test STDOUT & STDERR'
		   );

	  # Use bare blocks.

	  stdout_is { print "test" } "test", "Test STDOUT";
	  stderr_isnt { print "bad test" } "test", "Test STDERR";
	  output_is { print 'STDOUT'; print STDERR 'STDERR' }
	    "STDOUT", "STDERR", "Test output";

DESCRIPTION

       Test::Output provides a simple interface for testing output sent to STDOUT or STDERR. A number of different utilities are included to try
       and be as flexible as possible to the tester.

       Originally this module was designed not to have external requirements, however, the features provided by Sub::Exporter over what Exporter
       provides is just to great to pass up.

       Test::Output ties STDOUT and STDERR using Test::Output::Tie.

TESTS

   STDOUT
       stdout_is
       stdout_isnt
	      stdout_is  ( $coderef, $expected, 'description' );
	      stdout_is    { ... } $expected, 'description';
	      stdout_isnt( $coderef, $expected, 'description' );
	      stdout_isnt  { ... } $expected, 'description';

	   stdout_is() captures output sent to STDOUT from $coderef and compares it against $expected. The test passes if equal.

	   stdout_isnt() passes if STDOUT is not equal to $expected.

       stdout_like
       stdout_unlike
	      stdout_like  ( $coderef, qr/$expected/, 'description' );
	      stdout_like    { ... } qr/$expected/, 'description';
	      stdout_unlike( $coderef, qr/$expected/, 'description' );
	      stdout_unlike  { ... } qr/$expected/, 'description';

	   stdout_like() captures the output sent to STDOUT from $coderef and compares it to the regex in $expected. The test passes if the regex
	   matches.

	   stdout_unlike() passes if STDOUT does not match the regex.

   STDERR
       stderr_is
       stderr_isnt
	      stderr_is  ( $coderef, $expected, 'description' );
	      stderr_is    {... } $expected, 'description';
	      stderr_isnt( $coderef, $expected, 'description' );
	      stderr_isnt  {... } $expected, 'description';

	   stderr_is() is similar to stdout_is, except that it captures STDERR. The test passes if STDERR from $coderef equals $expected.

	   stderr_isnt() passes if STDERR is not equal to $expected.

       stderr_like
       stderr_unlike
	      stderr_like  ( $coderef, qr/$expected/, 'description' );
	      stderr_like   { ...} qr/$expected/, 'description';
	      stderr_unlike( $coderef, qr/$expected/, 'description' );
	      stderr_unlike  { ...} qr/$expected/, 'description';

	   stderr_like() is similar to stdout_like() except that it compares the regex $expected to STDERR captured from $codref. The test passes
	   if the regex matches.

	   stderr_unlike() passes if STDERR does not match the regex.

   COMBINED OUTPUT
       combined_is
       combined_isnt
	      combined_is   ( $coderef, $expected, 'description' );
	      combined_is   {... } $expected, 'description';
	      combined_isnt ( $coderef, $expected, 'description' );
	      combined_isnt {... } $expected, 'description';

	   combined_is() directs STDERR to STDOUT then captures STDOUT. This is equivalent to UNIXs 2>&1. The test passes if the combined STDOUT
	   and STDERR from $coderef equals $expected.

	   combined_isnt() passes if combined STDOUT and STDERR are not equal to $expected.

       combined_like
       combined_unlike
	      combined_like   ( $coderef, qr/$expected/, 'description' );
	      combined_like   { ...} qr/$expected/, 'description';
	      combined_unlike ( $coderef, qr/$expected/, 'description' );
	      combined_unlike { ...} qr/$expected/, 'description';

	   combined_like() is similar to combined_is() except that it compares a regex ($expected) to STDOUT and STDERR captured from $codref. The
	   test passes if the regex matches.

	   combined_unlike() passes if the combined STDOUT and STDERR does not match the regex.

   OUTPUT
       output_is
       output_isnt
	      output_is  ( $coderef, $expected_stdout, $expected_stderr, 'description' );
	      output_is    {... } $expected_stdout, $expected_stderr, 'description';
	      output_isnt( $coderef, $expected_stdout, $expected_stderr, 'description' );
	      output_isnt  {... } $expected_stdout, $expected_stderr, 'description';

	   The output_is() function is a combination of the stdout_is() and stderr_is() functions. For example:

	     output_is(sub {print "foo"; print STDERR "bar";},'foo','bar');

	   is functionally equivalent to

	     stdout_is(sub {print "foo";},'foo')
	       && stderr_is(sub {print STDERR "bar";'bar');

	   except that $coderef is only executed once.

	   Unlike, stdout_is() and stderr_is() which ignore STDERR and STDOUT repectively, output_is() requires both STDOUT and STDERR to match in
	   order to pass. Setting either $expected_stdout or $expected_stderr to "undef" ignores STDOUT or STDERR respectively.

	     output_is(sub {print "foo"; print STDERR "bar";},'foo',undef);

	   is the same as

	     stdout_is(sub {print "foo";},'foo')

	   output_isnt() provides the opposite function of output_is(). It is a combination of stdout_isnt() and stderr_isnt().

	     output_isnt(sub {print "foo"; print STDERR "bar";},'bar','foo');

	   is functionally equivalent to

	     stdout_is(sub {print "foo";},'bar')
	       && stderr_is(sub {print STDERR "bar";'foo');

	   As with output_is(), setting either $expected_stdout or $expected_stderr to "undef" ignores the output to that facility.

	     output_isnt(sub {print "foo"; print STDERR "bar";},undef,'foo');

	   is the same as

	     stderr_is(sub {print STDERR "bar";},'foo')

       output_like
       output_unlike
	     output_like  ( $coderef, $regex_stdout, $regex_stderr, 'description' );
	     output_like  { ... } $regex_stdout, $regex_stderr, 'description';
	     output_unlike( $coderef, $regex_stdout, $regex_stderr, 'description' );
	     output_unlike { ... } $regex_stdout, $regex_stderr, 'description';

	   output_like() and output_unlike() follow the same principles as output_is() and output_isnt() except they use a regular expression for
	   matching.

	   output_like() attempts to match $regex_stdout and $regex_stderr against STDOUT and STDERR produced by $coderef. The test passes if both
	   match.

	     output_like(sub {print "foo"; print STDERR "bar";},qr/foo/,qr/bar/);

	   The above test is successful.

	   Like output_is(), setting either $regex_stdout or $regex_stderr to "undef" ignores the output to that facility.

	     output_like(sub {print "foo"; print STDERR "bar";},qr/foo/,undef);

	   is the same as

	     stdout_like(sub {print "foo"; print STDERR "bar";},qr/foo/);

	   output_unlike() test pass if output from $coderef doesn't match $regex_stdout and $regex_stderr.

EXPORTS

       By default, all tests are exported, however with the switch to Sub::Exporter export groups are now available to better limit imports.

       To import tests for STDOUT:

	 use Test::Output qw(:stdout);

       To import tests STDERR:

	 use Test::Output qw(:stderr);

       To import just the functions:

	 use Test::Output qw(:functions);

       And to import all tests:

	 use Test::Output;

       The following is a list of group names and which functions are exported:

       stdout
	   stdout_is stdout_isnt stdout_like stdout_unlike

       stderr
	   stderr_is stderr_isnt stderr_like stderr_unlike

       output
	   output_is output_isnt output_like output_unlike

       combined
	   combined_is combined_isnt combined_like combined_unlike

       tests
	   All of the above, this is the default when no options are given.

       Sub::Exporter allows for many other options, I encourage reading its documentation.

FUNCTIONS

   stdout_from
	 my $stdout = stdout_from($coderef)
	 my $stdout = stdout_from { ... };

       stdout_from() executes $coderef and captures STDOUT.

   stderr_from
	 my $stderr = stderr_from($coderef)
	 my $stderr = stderr_from { ... };

       stderr_from() executes $coderef and captures STDERR.

   output_from
	 my ($stdout, $stderr) = output_from($coderef)
	 my ($stdout, $stderr) = output_from {...};

       output_from() executes $coderef one time capturing both STDOUT and STDERR.

   combined_from
	 my $combined = combined_from($coderef);
	 my $combined = combined_from {...};

       combined_from() executes $coderef one time combines STDOUT and STDERR, and captures them. combined_from() is equivalent to using 2>&1 in
       UNIX.

AUTHOR

       Currently maintained by brian d foy, "bdfoy@cpan.org".

       Shawn Sorichetti, "<ssoriche@cpan.org>"

SOURCE AVAILABILITY

       This module is in Github:

	       http://github.com/briandfoy/test-output/tree/master

BUGS

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

ACKNOWLEDGEMENTS

       Thanks to chromatic whose TieOut.pm was the basis for capturing output.

       Also thanks to rjbs for his help cleaning the documention, and pushing me to Sub::Exporter.

       Thanks to David Wheeler for providing code block support and tests.

       Thanks to Michael G Schwern for the solution to combining STDOUT and STDERR.

COPYRIGHT &; LICENSE
       Copyright 2005-2008 Shawn Sorichetti, All Rights Reserved.

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

perl v5.16.2							    2011-04-21							   Test::Output(3)