"Wide character in ..." is a warning. See "perldiag: Wide character in %s". Please stop calling it an error.

You showed this warning when using Test::More: 

Wide character in print at /.../Test2/Formatter/TAP.pm line 125.

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I simulated that warning when using Test::More: 

Wide character in print at /.../Test2/Formatter/TAP.pm line 156.

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The only difference being the line number which I'd guess, in the absence of other information, is due to you using a different version. Test::More and Test2::Formatter::TAP (along with many other modules) are part of the Test-Simple distribution. I'm using: 

$ perl -E 'use Test::More; say $Test::More::VERSION;'
1.302195

$ perl -E 'use Test2::Formatter::TAP; say $Test2::Formatter::TAP::VERS
+ION;'
1.302195

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What version are you using?

My line 156 looks like this: 

print $io $ok;

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What does your line 125 look like?

I provided you with a solution to your problem by using: 

use open OUT => qw{:encoding(UTF-8) :std};

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Did you try that? If so, what was the outcome? If not, why not?

The issue here is in no way specific to Test::More. Consider this code which generates the warning: 

$ perl -e '
    print "\N{DROMEDARY CAMEL}\n";
'
Wide character in print at -e line 2.
🐪

And this code which does not: 

$ perl -e '
    use open OUT => qw{:encoding(UTF-8) :std};
    print "\N{DROMEDARY CAMEL}\n";
'
🐪

— Ken

In reply to Re^4: Listing out the characters included in a character class [wide character warning] by kcott
in thread Listing out the characters included in a character class by Polyglot

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