t/2-ops/math_addition.t

   1 #!perl
   2 #
   3 # This file is part of Language::Befunge.
   4 # Copyright (c) 2001-2008 Jerome Quelin, all rights reserved.
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the same terms as Perl itself.
   8 #
   9 #
  10
  11 use Language::Befunge::Ops;
  12
  13 use strict;
  14 use warnings;
  15
  16 use Language::Befunge::Interpreter;
  17 use Language::Befunge::IP;
  18 use Language::Befunge::Ops;
  19 use Test::More tests => 4;
  20
  21 my ($lbi, $ip, $v);
  22
  23
  24 $lbi = Language::Befunge::Interpreter->new;
  25 $ip  = Language::Befunge::IP->new;
  26 $lbi->set_curip( $ip );
  27
  28 $ip->spush( 21, 42, 63 );
  29 Language::Befunge::Ops::math_addition( $lbi );
  30 is( $ip->spop, 105, 'math_addition pushes new value' );
  31 is( $ip->spop, 21,  'math_addition pops only two values' );
  32
  33 SKIP: {
  34     eval { require Test::Exception; Test::Exception->import; };
  35     skip 'need Test::Exception', 2 unless defined $Test::Exception::VERSION;
  36     # overflow
  37     $ip->spush( 2**31-2, 3 );
  38     throws_ok( sub { Language::Befunge::Ops::math_addition($lbi) },
  39         qr/overflow/, 'math_addition barfs on overflow' );
  40     # underflow
  41     $ip->spush( -2**31+2, -3 );
  42     throws_ok( sub { Language::Befunge::Ops::math_addition($lbi) },
  43         qr/under/, 'math_addition barfs on underflow' );
  44 }