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#!perl -T
use 5.010;
use strict;
use warnings FATAL => 'all';
use Test::More tests => 10;
use Test::Fatal;
use Statistics::R::REXP::Null;
my $null = new_ok('Statistics::R::REXP::Null', [], 'new null');
is($null, $null, 'self equality');
my $null_2 = Statistics::R::REXP::Null->new;
is($null, $null_2, 'null equality');
isnt($null, 'null', 'null inequality');
ok($null->is_null, 'is null');
ok(! $null->is_vector, 'is not vector');
is($null .'', 'NULL', 'null text representation');
## attributes
is_deeply($null->attributes, undef, 'default attributes');
## cannot set attributes on Null
like(exception {
Statistics::R::REXP::Null->new(attributes => { foo => 'bar', x => 42 })
}, qr/Null cannot have attributes/, 'setting null attributes');
## Perl representation
is_deeply($null->to_pl,
undef, 'Perl representation');
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