trap.t

来自「source of perl for linux application,」· T 代码 · 共 93 行

#!/usr/bin/perl -w

# test that config ( trap_nan => 1, trap_inf => 1) really works/dies

use strict;
use Test::More;

BEGIN
  {
  $| = 1;
  chdir 't' if -d 't';
  unshift @INC, '../lib'; # for running manually
  plan tests => 43;
  } 

use Math::BigInt;
use Math::BigFloat;

my $mbi = 'Math::BigInt'; my $mbf = 'Math::BigFloat';
my ($cfg,$x);

foreach my $class ($mbi, $mbf)
  {
  # can do and defaults are okay?
  ok ($class->can('config'), 'can config()');
  is ($class->config()->{trap_nan}, 0, 'trap_nan defaults to 0');
  is ($class->config()->{trap_inf}, 0, 'trap_inf defaults to 0');

  # can set?
  $cfg = $class->config( trap_nan => 1 );
  is ($cfg->{trap_nan},1, 'trap_nan now true');

  # also test that new() still works normally
  eval ("\$x = \$class->new('42'); \$x->bnan();");
  like ($@, qr/^Tried to set/, 'died');
  is ($x,42,'$x after new() never modified');

  # can reset?
  $cfg = $class->config( trap_nan => 0 );
  is ($cfg->{trap_nan}, 0, 'trap_nan disabled');
  
  # can set?
  $cfg = $class->config( trap_inf => 1 );
  is ($cfg->{trap_inf}, 1, 'trap_inf enabled');

  eval ("\$x = \$class->new('4711'); \$x->binf();");
  like ($@, qr/^Tried to set/, 'died');
  is ($x,4711,'$x after new() never modified');

  eval ("\$x = \$class->new('inf');");
  like ($@, qr/^Tried to set/, 'died');
  is ($x,4711,'$x after new() never modified');
  
  eval ("\$x = \$class->new('-inf');");
  like ($@, qr/^Tried to set/, 'died');
  is ($x,4711,'$x after new() never modified');
  
  # +$x/0 => +inf
  eval ("\$x = \$class->new('4711'); \$x->bdiv(0);");
  like ($@, qr/^Tried to set/, 'died');
  is ($x,4711,'$x after new() never modified');
  
  # -$x/0 => -inf
  eval ("\$x = \$class->new('-0815'); \$x->bdiv(0);");
  like ($@, qr/^Tried to set/, 'died');
  is ($x,'-815', '$x after new not modified');
  
  $cfg = $class->config( trap_nan => 1 );
  # 0/0 => NaN
  eval ("\$x = \$class->new('0'); \$x->bdiv(0);");
  like ($@, qr/^Tried to set/, 'died');
  is ($x,'0', '$x after new not modified');
  }

##############################################################################
# BigInt

$x = Math::BigInt->new(2);
eval ("\$x = \$mbi->new('0.1');");
is ($x,2,'never modified since it dies');
eval ("\$x = \$mbi->new('0a.1');");
is ($x,2,'never modified since it dies');

##############################################################################
# BigFloat

$x = Math::BigFloat->new(2);
eval ("\$x = \$mbf->new('0.1a');");
is ($x,2,'never modified since it dies');

# all tests done