source: vendor/perl/5.8.8/t/comp/utf.t

#!./perl

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
    unless (find PerlIO::Layer 'perlio') {
        print "1..0 # Skip: not perlio\n";
        exit 0;
    }
    if ($ENV{PERL_CORE_MINITEST}) {
        print "1..0 # Skip: no dynamic loading on miniperl, no threads\n";
        exit 0;
    }
    require Config; import Config;
    if ($Config{'extensions'} !~ /\bEncode\b/) {
      print "1..0 # Skip: Encode was not built\n";
      exit 0;
    }
}

require "./test.pl";

plan(tests => 15);

my $BOM = chr(0xFEFF);

sub test {
    my ($enc, $tag, $bom) = @_;
    open(UTF_PL, ">:raw:encoding($enc)", "utf.pl")
        or die "utf.pl($enc,$tag,$bom): $!";
    print UTF_PL $BOM if $bom;
    print UTF_PL "$tag\n";
    close(UTF_PL);
    my $got = do "./utf.pl";
    is($got, $tag);
}

test("utf16le",    123,   1);
test("utf16le",    1234,  1);
test("utf16le",    12345, 1);
test("utf16be",    123,   1);
test("utf16be",    1234,  1);
test("utf16be",    12345, 1);
test("utf8",       123,   1);
test("utf8",       1234,  1);
test("utf8",       12345, 1);

test("utf16le",    123,   0);
test("utf16le",    1234,  0);
test("utf16le",    12345, 0);
test("utf16be",    123,   0);
test("utf16be",    1234,  0);
test("utf16be",    12345, 0);

END {
    1 while unlink "utf.pl";
}