deeph.t   [plain text]

#!perl -I..

# Test Hash vs Hash1 functionality

use strict;
use Test::More tests => 13;

# Find the module (1 test)
BEGIN {use_ok('Readonly'); }

sub expected
{
    my $line = shift;
    $@ =~ s/\.$//;   # difference between croak and die
    return "Modification of a read-only value attempted at " . __FILE__ . " line $line\n";
}

use vars qw/%h1 %h2/;
my $m1 = 17;

# Create (2 tests)
eval {Readonly::Hash  %h1 => (key1 => \$m1, key2 => {x => 5, z => [1, 2, 3]})};
is $@ => '', 'Create a deep reference array';
eval {Readonly::Hash1 %h2 => (key1 => \$m1, key2 => {x => 5, z => [1, 2, 3]})};
is $@ => '', 'Create a shallow reference array';

# Modify (10 tests)
eval {$h1{key1} = 7};
is $@ => expected(__LINE__-1), 'Modify h1';
eval {$h2{key1} = 7};
is $@ => expected(__LINE__-1), 'Modify h2';

eval {${$h1{key1}} = "the"};
is $@ => expected(__LINE__-1), 'Deep-modify h1';
is $m1 => 17, 'h1 unchanged';

eval {${$h2{key1}} = "the"};
is $@ => '', 'Deep-modify h2';
is $m1 => 'the', 'h2 modification successful';

eval {$h1{key2}{z}[1] = 42};
is $@ => expected(__LINE__-1), 'Deep-deep modify h1';
is $h1{key2}{z}[1] => 2, 'h1 unchanged';

eval {$h2{key2}{z}[2] = 42};
is $@ => '', 'Deep-deep modify h2';
is $h2{key2}{z}[2], 42, 'h2 mod successful';