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|
#!./perl
use strict;
use warnings;
BEGIN {
unless (-d 'blib') {
chdir 't' if -d 't';
@INC = '../lib';
}
}
use utf8;
use open qw( :utf8 :std );
require './test.pl';
plan(skip_all => "Your system has no SIGALRM") if !exists $SIG{ALRM};
plan(tests => 8);
require mro;
=pod
These are like the 010_complex_merge_classless test,
but an infinite loop has been made in the heirarchy,
to test that we can fail cleanly instead of going
into an infinite loop
=cut
# initial setup, everything sane
{
package ƙ;
use mro 'c3';
our @ISA = qw/ᶨ ィ/;
package ᶨ;
use mro 'c3';
our @ISA = qw/ｆ/;
package ィ;
use mro 'c3';
our @ISA = qw/ʰ ｆ/;
package ʰ;
use mro 'c3';
our @ISA = qw/ᶢ/;
package ᶢ;
use mro 'c3';
our @ISA = qw/ᛞ/;
package ｆ;
use mro 'c3';
our @ISA = qw/ǝ/;
package ǝ;
use mro 'c3';
our @ISA = qw/ᛞ/;
package ᛞ;
use mro 'c3';
our @ISA = qw/Ạ Ｂ ʗ/;
package ʗ;
use mro 'c3';
our @ISA = qw//;
package Ｂ;
use mro 'c3';
our @ISA = qw//;
package Ạ;
use mro 'c3';
our @ISA = qw//;
}
# A series of 8 aberations that would cause infinite loops,
# each one undoing the work of the previous
my @loopies = (
sub { @ǝ::ISA = qw/ｆ/ },
sub { @ǝ::ISA = qw/ᛞ/; @ʗ::ISA = qw/ｆ/ },
sub { @ʗ::ISA = qw//; @Ạ::ISA = qw/ƙ/ },
sub { @Ạ::ISA = qw//; @ᶨ::ISA = qw/ｆ ƙ/ },
sub { @ᶨ::ISA = qw/ｆ/; @ʰ::ISA = qw/ƙ ᶢ/ },
sub { @ʰ::ISA = qw/ᶢ/; @Ｂ::ISA = qw/Ｂ/ },
sub { @Ｂ::ISA = qw//; @ƙ::ISA = qw/ƙ ᶨ ィ/ },
sub { @ƙ::ISA = qw/ᶨ ィ/; @ᛞ::ISA = qw/Ạ ʰ Ｂ ʗ/ },
);
foreach my $loopy (@loopies) {
eval {
local $SIG{ALRM} = sub { die "ALRMTimeout" };
alarm(3);
$loopy->();
mro::get_linear_isa('ƙ', 'c3');
};
if(my $err = $@) {
if($err =~ /ALRMTimeout/) {
ok(0, "Loop terminated by SIGALRM");
}
elsif($err =~ /Recursive inheritance detected/) {
ok(1, "Graceful exception thrown");
}
else {
ok(0, "Unrecognized exception: $err");
}
}
else {
ok(0, "Infinite loop apparently succeeded???");
}
}
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