This is 0.77_50 - update META.yml, and add META.json
[p5sagit/Devel-Size.git] / t / basic.t
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0430b7f7 1#!/usr/bin/perl -w
e98cedbf 2
78037efb 3use Test::More tests => 30;
0430b7f7 4use strict;
6c3d85e7 5use Devel::Size qw(size total_size);
e98cedbf 6
0430b7f7 7can_ok ('Devel::Size', qw/
8 size
9 total_size
10 /);
e98cedbf 11
5a83b7cf 12die ("Uhoh, test uses an outdated version of Devel::Size")
3cba7a2c 13 unless is ($Devel::Size::VERSION, '0.77_50', 'VERSION MATCHES');
0430b7f7 14
15#############################################################################
16# some basic checks:
e98cedbf 17
5073b933 18use vars qw($foo @foo %foo);
19$foo = "12";
20@foo = (1,2,3);
21%foo = (a => 1, b => 2);
b98fcdb9 22
23my $x = "A string";
9fc9ab86 24my $y = "A much much longer string"; # need to be at least 7 bytes longer for 64 bit
1c566e6a 25cmp_ok(size($x), '<', size($y), 'size() of strings');
26cmp_ok(total_size($x), '<', total_size($y), 'total_size() of strings');
b98fcdb9 27
28my @x = (1..4);
0430b7f7 29my @y = (1..200);
30
31my $size_1 = total_size(\@x);
32my $size_2 = total_size(\@y);
33
1c566e6a 34cmp_ok($size_1, '<', $size_2, 'size() of array refs');
0430b7f7 35
50f7a785 36# the arrays alone shouldn't be the same size
0430b7f7 37$size_1 = size(\@x);
38$size_2 = size(\@y);
39
50f7a785 40isnt ( $size_1, $size_2, 'size() of array refs');
0430b7f7 41
42#############################################################################
43# IV vs IV+PV (bug #17586)
b98fcdb9 44
0430b7f7 45$x = 12;
46$y = 12; $y .= '';
b98fcdb9 47
0430b7f7 48$size_1 = size($x);
49$size_2 = size($y);
b98fcdb9 50
1c566e6a 51cmp_ok($size_1, '<', $size_2, ' ."" makes string longer');
0430b7f7 52
53#############################################################################
78dfb4e7 54# check that the tracking_hash is working
55
56my($a,$b) = (1,2);
57my @ary1 = (\$a, \$a);
58my @ary2 = (\$a, \$b);
59
cf1d079f 60cmp_ok(total_size(\@ary1), '<', total_size(\@ary2),
61 'the tracking hash is working');
78dfb4e7 62
0430b7f7 63#############################################################################
78dfb4e7 64# check that circular references don't mess things up
65
66my($c1,$c2); $c2 = \$c1; $c1 = \$c2;
67
0430b7f7 68is (total_size($c1), total_size($c2), 'circular references');
69
9fc9ab86 70##########################################################
71# RT#14849 (& RT#26781 and possibly RT#29238?)
cf1d079f 72cmp_ok( total_size( sub{ do{ my $t=0 }; } ), '>', 0,
73 'total_size( sub{ my $t=0 } ) > 0' );
87372f42 74
75# CPAN RT #58484 and #58485
cf1d079f 76cmp_ok(total_size(\&total_size), '>', 0, 'total_size(\&total_size) > 0');
87372f42 77
66f50dda 78use constant LARGE => 'N' x 8192;
87372f42 79
66f50dda 80cmp_ok (total_size(\&LARGE), '>', 8192,
81 'total_size for a constant includes the constant');
2640cff1 82
83{
84 my $a = [];
85 my $b = \$a;
d6158a76 86 # Scalar::Util isn't in the core before 5.7.something.
87 # The test isn't really testing anything without the weaken(), but it
88 # isn't counter-productive or harmful to run it anyway.
89 unless (eval {
90 require Scalar::Util;
91 # making a weakref upgrades the target to PVMG and adds magic
92 Scalar::Util::weaken($b);
93 1;
94 }) {
95 die $@ if $] >= 5.008;
96 }
97
8c394e12 98 is(total_size($a), total_size([]),
99 'Any intial reference is dereferenced and discarded');
2640cff1 100}
a52ceccd 101
102# Must call direct - avoid all copying:
103foreach(['undef', total_size(undef)],
104 ['no', total_size(1 == 0)],
105 ['yes', total_size(1 == 1)],
106 ) {
107 my ($name, $size) = @$_;
108 is($size, 0,
109 "PL_sv_$name is interpeter wide, so not counted as part of the structure's size");
110}
95dc1714 111
112{
113 # SvOOK stuff
114 my $uurk = "Perl Rules";
115 # This may upgrade the scalar:
116 $uurk =~ s/Perl//;
117 $uurk =~ s/^/Perl/;
118 my $before_size = total_size($uurk);
119 my $before_length = length $uurk;
120 cmp_ok($before_size, '>', $before_length, 'Size before is sane');
121 $uurk =~ s/Perl //;
122 is(total_size($uurk), $before_size,
123 "Size doesn't change because OOK is used");
124 cmp_ok(length $uurk, '<', $before_size, 'but string is shorter');
125}
924d9c4e 126
127sub shared_hash_keys {
128 my %h = @_;
129 my $one = total_size([keys %h]);
130 cmp_ok($one, '>', 0, 'Size of one entry is sane');
131 my $two = total_size([keys %h, keys %h]);
132 cmp_ok($two, '>', $one, 'Two take more space than one');
133 my $increment = $two - $one;
134 is(total_size([keys %h, keys %h, keys %h]), $one + 2 * $increment,
135 'Linear size increase for three');
136 return $increment;
137}
138
139{
140 my $small = shared_hash_keys(Perl => 'Rules');
141 my $big = shared_hash_keys('x' x 1024, '');
142 SKIP: {
143 skip("[keys %h] doesn't copy as shared hash key scalars prior to 5.10.0",
144 1) if $] < 5.010;
145 is ($small, $big, 'The "shared" part of shared hash keys is spotted');
146 }
147}
78037efb 148
149{
150 use vars '%DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG';
151 my $hash_size = total_size(\%DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG);
152 cmp_ok($hash_size, '>', 0, 'Hash size is sane');
153 my $stash_size
154 = total_size(\%DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG::);
155 cmp_ok($stash_size, '>',
156 $hash_size + length 'DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG_DANG',
157 'Stash size is larger than hash size plus length of the name');
158}
159
160{
161 my %h = (Perl => 'Rules');
162 my $hash_size = total_size(\%h);
163 cmp_ok($hash_size, '>', 0, 'Hash size is sane');
164 my $a = keys %h;
165 if ($] < 5.010) {
166 is(total_size(\%h), $hash_size,
167 "Creating iteration state doesn't need to allocate storage");
168 # because all hashes carry the overhead of this storage from creation
169 } else {
170 cmp_ok(total_size(\%h), '>', $hash_size,
171 'Creating iteration state allocates storage');
172 }
173}