You don't. :) It's just a canned message. Why do you need to test if something was printed? That's not very helpful. Instead test what is about to be printed, before you print it. In fact, you don't need to print anything at all from your test suite (except user interaction messages like "Test this?" and your own debugging when your test has "bugs").

Now, don't get me wrong - what you originally wanted can be done, but do you really want to go there? 

use IO::Scalar;
use Test::More qw(no_plan);

my $string;
tie *STDOUT, 'IO::Scalar', \$string;

ok(test_foo() eq 'bar');
ok($string eq 'foo');
$string = '';

ok(test_bar() eq 'baz');
ok($string eq 'bar');
$string = '';

sub test_foo {
   print 'foo';
   return 'bar';
}

sub test_bar {
   print 'bar';
   return 'baz';
}

[download]
No thanks. :)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to 3Re: Tests for 'printing' code by jeffa
in thread Tests for 'printing' code by dda

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.