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  1. or download this
    #!/usr/bin/env perl
    
    ...
    my $input = prompt('Enter: ', 50);
    
    print "$input\n";
    
  2. or download this
    use Test::More;
    
    ...
    ok 0 == $exit, 'Clean exit code.';
    like $stderr, qr/^\QIs interactive? No/, 'Detected non-interactive mod
    +e.';
    is $stdout, "Enter:  [50] 50\n50\n", 'Correct output.';