Why do my Perl tests fail with use encoding 'utf8'?

Question

I\'m puzzled with this test script:

#!perl

use strict;
use warnings;
use encoding \'utf8\';
use Test::More \'no_plan\';

ok(\'áá\' =~ m/á/, \'ok direct matc         


        

Answer 1

The Test::More documentation contains a fix for this issue, which I just found today (and this entry shows higher in the googles).

utf8 / "Wide character in print"

If you use utf8 or other non-ASCII characters with Test::More you might get a "Wide character in print" warning. Using binmode STDOUT, ":utf8" will not fix it. Test::Builder (which powers Test::More) duplicates STDOUT and STDERR. So any changes to them, including changing their output disciplines, will not be seem by Test::More. The work around is to change the filehandles used by Test::Builder directly.

my $builder = Test::More->builder;
binmode $builder->output,         ":utf8";
binmode $builder->failure_output, ":utf8";
binmode $builder->todo_output,    ":utf8";

I added this bit of boilerplate to my testing code and it works a charm.