3 # $Id: canonical.t,v 1.0 2000/09/01 19:40:41 ram Exp $
5 # Copyright (c) 1995-2000, Raphael Manfredi
7 # You may redistribute only under the same terms as Perl 5, as specified
8 # in the README file that comes with the distribution.
10 # $Log: canonical.t,v $
11 # Revision 1.0 2000/09/01 19:40:41 ram
12 # Baseline for first official release.
21 require Config; import Config;
22 if ($ENV{PERL_CORE} and $Config{'extensions'} !~ /\bStorable\b/) {
23 print "1..0 # Skip: Storable was not built\n";
29 use Storable qw(freeze thaw dclone);
30 use vars qw($debugging $verbose);
35 my($testno, $ok) = @_;
36 print "not " unless $ok;
41 # Uncomment the folowing line to get a dump of the constructed data structure
42 # (you may want to reduce the size of the hashes too)
49 # Use MD5 if its available to make random string keys
51 eval { require "MD5.pm" };
54 # Use Data::Dumper if debugging and it is available to create an ASCII dump
57 eval { require "Data/Dumper.pm" };
61 @fixed_strings = ("January", "February", "March", "April", "May", "June",
62 "July", "August", "September", "October", "November", "December" );
64 # Build some arbitrarily complex data structure starting with a top level hash
65 # (deeper levels contain scalars, references to hashes or references to arrays);
67 for (my $i = 0; $i < $hashsize; $i++) {
68 my($k) = int(rand(1_000_000));
69 $k = MD5->hexhash($k) if $gotmd5 and int(rand(2));
70 $a1{$k} = { key => "$k", value => $i };
72 # A third of the elements are references to further hashes
76 my($hash2size) = int(rand($maxhash2size));
77 while ($hash2size--) {
78 my($k2) = $k . $i . int(rand(100));
79 $hash2->{$k2} = $fixed_strings[rand(int(@fixed_strings))];
81 $a1{$k}->{value} = $hash2;
84 # A further third are references to arrays
86 elsif (int(rand(2))) {
88 my($arraysize) = int(rand($maxarraysize));
89 while ($arraysize--) {
90 push(@$arr_ref, $fixed_strings[rand(int(@fixed_strings))]);
92 $a1{$k}->{value} = $arr_ref;
97 print STDERR Data::Dumper::Dumper(\%a1) if ($verbose and $gotdd);
100 # Copy the hash, element by element in order of the keys
102 foreach $k (sort keys %a1) {
103 $a2{$k} = { key => "$k", value => $a1{$k}->{value} };
106 # Deep clone the hash
110 # In canonical mode the frozen representation of each of the hashes
111 # should be identical
113 $Storable::canonical = 1;
119 ok 1, (length($x1) > $hashsize); # sanity check
120 ok 2, length($x1) == length($x2); # idem
124 # In normal mode it is exceedingly unlikely that the frozen
125 # representaions of all the hashes will be the same (normally the hash
126 # elements are frozen in the order they are stored internally,
127 # i.e. pseudo-randomly).
129 $Storable::canonical = 0;
136 # Two out of three the same may be a coincidence, all three the same
137 # is much, much more unlikely. Still it could happen, so this test
138 # may report a false negative.
140 ok 5, ($x1 ne $x2) || ($x1 ne $x3);
143 # Ensure refs to "undef" values are properly shared
144 # Same test as in t/dclone.t to ensure the "canonical" code is also correct
147 push @{$$hash{''}}, \$$hash{a};
148 ok 6, $$hash{''}[0] == \$$hash{a};
150 my $cloned = dclone(dclone($hash));
151 ok 7, $$cloned{''}[0] == \$$cloned{a};
153 $$cloned{a} = "blah";
154 ok 8, $$cloned{''}[0] == \$$cloned{a};