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|
#!./perl
use strict;
use warnings;
BEGIN {
unless (-d 'blib') {
chdir 't' if -d 't';
@INC = '../lib';
}
}
use Test::More;
use mro;
plan skip_all => "Your system has no SIGALRM" if !exists $SIG{ALRM};
plan tests => 8;
=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 K;
our @ISA = qw/J I/;
package J;
our @ISA = qw/F/;
package I;
our @ISA = qw/H F/;
package H;
our @ISA = qw/G/;
package G;
our @ISA = qw/D/;
package F;
our @ISA = qw/E/;
package E;
our @ISA = qw/D/;
package D;
our @ISA = qw/A B C/;
package C;
our @ISA = qw//;
package B;
our @ISA = qw//;
package A;
our @ISA = qw//;
}
# A series of 8 abberations that would cause infinite loops,
# each one undoing the work of the previous
my @loopies = (
sub { @E::ISA = qw/F/ },
sub { @E::ISA = qw/D/; @C::ISA = qw/F/ },
sub { @C::ISA = qw//; @A::ISA = qw/K/ },
sub { @A::ISA = qw//; @J::ISA = qw/F K/ },
sub { @J::ISA = qw/F/; @H::ISA = qw/K G/ },
sub { @H::ISA = qw/G/; @B::ISA = qw/B/ },
sub { @B::ISA = qw//; @K::ISA = qw/K J I/ },
sub { @K::ISA = qw/J I/; @D::ISA = qw/A H B C/ },
);
foreach my $loopy (@loopies) {
eval {
local $SIG{ALRM} = sub { die "ALRMTimeout" };
alarm(3);
$loopy->();
mro::get_linear_isa('K', '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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