#!/usr/bin/perl -w
use warnings;
use strict;
use feature qw(switch say);
use English;

use Test::More  tests => 20; #'no_plan'; 
use Test::MockObject;
use Test::Output;
use Test::Trap;

my $mock = Test::MockObject->new();
$mock->fake_module ('NaServer', 
                new    => sub { return 'NaServer' },
                get_val  => sub { return 500 },
                );
use_ok( 'NaServer' )  or exit; ## includes 'use NaServer;' 

# Construction of $s just for testing
my $s = NaServer->new( 'sim8aXXXXXX', 1, 6 );
isa_ok( $s, 'NaServer');

# ==================================
# = Tests of the script start here =
# ==================================
use File::Slurp;
#my $script = 'script_to_test_with_subs.pl';  # used __DATA__ instead
my $code_to_test = do { local $/; <DATA> };
my @cases = ( 
                {   
                    name => 'wrong_threshold',
                    argv => 'hudriwudri',
                    expected_stdout => qr'invalid argument',
                    expected_stderr => '',
                    expected_exit => 3,
                },
                {
                    name => 'high_threshold',
                    argv => 1000,
                    expected_stdout => qr'OK',
                    expected_stderr => '',
                    expected_exit => 0,
                }    
            );
foreach my $case (@cases) {
    use_ok('NaServer');
    can_ok( 'NaServer', 'new');
    can_ok( 'NaServer', 'get_val');
    my @r = trap {  
        $ARGV[0] = $case->{'argv'};
        #eval read_file($script);
        eval $code_to_test; ## no critic (ProhibitStringyEval)
        if (defined $EVAL_ERROR) { die $EVAL_ERROR };
    };
    if ($trap->die) {
        croak $trap->die;
    }
    if ($trap->warn) {
        foreach (@{$trap->warn}) {
            warn $_ . "\n";
        }
    }
    like ( $trap->stdout, $case->{'expected_stdout'}, 
       "$case->{'name'}: stdout as expected" );
    is ( $trap->stderr, $case->{'expected_stderr'},
       "$case->{'name'}: stderr as expected" );
    is ( $trap->exit, $case->{'expected_exit'}, 
       "$case->{'name'}: exit-value as expected" );
}

__DATA__

# ==================
# = Script to Test =
# ==================

#!/usr/bin/perl -w
use warnings;
use strict;
use feature qw(switch say);
use NaServer;

my $threshold = $ARGV[0] || exit 3;
if ($threshold =~ /\d+/) {
    my $session = NaServer->new();
    my $val = $session->get_val();
    if ($val > $threshold ) {
        say_it ("Value to high: " . $val);
        exit 2;
    } else {
        say_it ("Value OK ($val)");
        exit 0;
    }
    
} else {
    say 'invalid argument';
    exit 3;
}

sub say_it {
    my $msg = shift;
    say $msg;
    return;
}