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#!/usr/bin/perl
use v5.14;
use warnings;
use Test2::V0 0.000148; # is_refcount
use List::Keywords 'ngrep';
# 2-at-a-time
{
is( [ngrep my ($k, $v) { } ()], [], 'ngrep empty in list context');
is( scalar(ngrep my ($k, $v) { } ()), 0, 'ngrep empty in scalar context');
my @values;
is( [ngrep my ($k, $v) { @values = ($k, $v); length $k == 3 } ( one => 1, two => 2, three => 3 )],
[one => 1, two => 2],
'ngrep in list context' );
is( \@values, [ three => 3 ], 'ngrep code block saw correct values' );
is( scalar(ngrep my ($k, $v) { length $k == 3 } ( one => 1, two => 2, three => 3 )), 4,
'ngrep in scalar context' );
is( [ngrep my ($k, $v) { @values = ($k, $v) } ( one => 1, missing => )],
[one => 1, missing => ],
'ngrep with short list does not invent undef' );
is( \@values, [ missing => undef ],
'ngrep code block still saw missing value as undef' );
}
# stack discipline
{
is( [1, (ngrep my ($x) { 1 } 2), 3], [1, 2, 3],
'ngrep behaves correctly as list operator' );
}
# refcounts
{
my $arr = [];
is_oneref( $arr, '$arr has one reference before test' );
my $result;
( $result ) = ngrep my ($x) { defined $x } undef, $arr, undef;
is_refcount( $arr, 2, '$arr has two references after ngrep my ($x) BLOCK' );
undef $result;
is_oneref( $arr, '$arr has one reference at end of test' );
}
done_testing;
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