source: vendor/perl/5.8.8/t/op/lc_user.t

BEGIN {
    chdir 't';
    @INC = '../lib';
    require './test.pl';
}

plan tests => 4;

sub ToUpper {
    return <<END;
0061    0063    0041
END
}

is("\Ufoo\x{101}", "foo\x{101}", "no changes on 'foo'");
is("\Ubar\x{101}", "BAr\x{101}", "changing 'ab' on 'bar' ");

sub ToLower {
    return <<END;
0041            0061
END
}

is("\LFOO\x{100}", "FOO\x{100}", "no changes on 'FOO'");
is("\LBAR\x{100}", "BaR\x{100}", "changing 'A' on 'BAR' ");