Commit | Line | Data |
e1a479c5 |
1 | #!./perl |
2 | |
3 | use strict; |
4 | use warnings; |
5 | BEGIN { |
6 | unless (-d 'blib') { |
7 | chdir 't' if -d 't'; |
8 | @INC = '../lib'; |
9 | } |
10 | } |
11 | |
12 | use Test::More; |
13 | use mro; |
14 | |
15 | plan skip_all => "Your system has no SIGALRM" if !exists $SIG{ALRM}; |
16 | plan tests => 8; |
17 | |
18 | =pod |
19 | |
20 | These are like the 010_complex_merge_classless test, |
21 | but an infinite loop has been made in the heirarchy, |
22 | to test that we can fail cleanly instead of going |
23 | into an infinite loop |
24 | |
25 | =cut |
26 | |
27 | # initial setup, everything sane |
28 | { |
29 | package K; |
30 | our @ISA = qw/J I/; |
31 | package J; |
32 | our @ISA = qw/F/; |
33 | package I; |
34 | our @ISA = qw/H F/; |
35 | package H; |
36 | our @ISA = qw/G/; |
37 | package G; |
38 | our @ISA = qw/D/; |
39 | package F; |
40 | our @ISA = qw/E/; |
41 | package E; |
42 | our @ISA = qw/D/; |
43 | package D; |
44 | our @ISA = qw/A B C/; |
45 | package C; |
46 | our @ISA = qw//; |
47 | package B; |
48 | our @ISA = qw//; |
49 | package A; |
50 | our @ISA = qw//; |
51 | } |
52 | |
53 | # A series of 8 abberations that would cause infinite loops, |
54 | # each one undoing the work of the previous |
55 | my @loopies = ( |
56 | sub { @E::ISA = qw/F/ }, |
57 | sub { @E::ISA = qw/D/; @C::ISA = qw/F/ }, |
58 | sub { @C::ISA = qw//; @A::ISA = qw/K/ }, |
59 | sub { @A::ISA = qw//; @J::ISA = qw/F K/ }, |
60 | sub { @J::ISA = qw/F/; @H::ISA = qw/K G/ }, |
61 | sub { @H::ISA = qw/G/; @B::ISA = qw/B/ }, |
62 | sub { @B::ISA = qw//; @K::ISA = qw/K J I/ }, |
63 | sub { @K::ISA = qw/J I/; @D::ISA = qw/A H B C/ }, |
64 | ); |
65 | |
66 | foreach my $loopy (@loopies) { |
67 | eval { |
68 | local $SIG{ALRM} = sub { die "ALRMTimeout" }; |
69 | alarm(3); |
70 | $loopy->(); |
71 | mro::get_linear_isa('K', 'dfs'); |
72 | }; |
73 | |
74 | if(my $err = $@) { |
75 | if($err =~ /ALRMTimeout/) { |
76 | ok(0, "Loop terminated by SIGALRM"); |
77 | } |
78 | elsif($err =~ /Recursive inheritance detected/) { |
79 | ok(1, "Graceful exception thrown"); |
80 | } |
81 | else { |
82 | ok(0, "Unrecognized exception: $err"); |
83 | } |
84 | } |
85 | else { |
86 | ok(0, "Infinite loop apparently succeeded???"); |
87 | } |
88 | } |