use 5.010;
use warnings;
use Test::More 'no_plan';

use IO::Prompter;

local *ARGV;
open *ARGV, '<', \<<END_INPUT or die $!;
1
a
b
-2234
-1
0
2
1
3
5
-177
END_INPUT

{
    use IO::Prompter [-integer];

    if (prompt "Enter an integer: ") {
        like $_, qr/^\s*[+-]?\d++\s*/ => 'First line retrieved';
    }
    else {
        fail 'First line retrieved'; 
    }

    {
        $_ = 'UNDERBAR';
        if (my $input = prompt "Enter another integer: ") {
            like $input, qr/^\s*[+-]?\d++\s*/ => 'Second line retrieved';
            is $_,       'UNDERBAR'           => 'Second line left $_ alone';
        }
        else {
            fail 'Second line retrieved'; 
        }
    }
}

{
    use IO::Prompter [-must=>{'be pos odd'=>sub{ $_ > 0 && $_ % 2}}];

    if (prompt "Enter an integer: ") {
        is $_, 1 => 'Constrained line retrieved';
    }
    else {
        fail 'Constrained line retrieved'; 
    }

    use IO::Prompter [];  # Turn off previous options

    if (prompt -integer=>qr/7/, "Enter an integer: ") {
        is $_, -177 => 'Constrained line 2 retrieved';
    }
    else {
        fail 'Constrained line 2 retrieved'; 
    }
}