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PJACKLAM / Math-BigInt-2.005002 / xt / author / from_dec-mbi-mbr.t 

            

              
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# -*- mode: perl; -*-
# The purpose is primarily to test upgrading and downgrading, not whether the
# method returns the correct value for various input. That is tested elsewhere.
use strict;
use warnings;
use Scalar::Util 'refaddr';
use Test::More;
use Math::BigRat;
note "\nNo upgrading or downgrading\n\n";
Math::BigInt -> upgrade(undef);
Math::BigRat -> downgrade(undef);
subtest '$x = Math::BigInt -> from_dec("4.5");'
  => sub {
      # this must not upgrade
      my $x = Math::BigInt -> from_dec("4.5");
      is(ref($x), "Math::BigInt", "class");
      is($x, "NaN", "value");
  };
subtest '$x = Math::BigRat -> from_dec("4");'
  => sub {
      # this must not downgrade
      my $x = Math::BigRat -> from_dec("4");
      is(ref($x), "Math::BigRat", "class");
      is($x, "4", "value");
  };
subtest '$x = Math::BigInt -> new("4"); $q = $x -> from_dec("4.5");'
  => sub {
      # this must not upgrade
      my $x = Math::BigInt -> new("4");
      my $q = $x -> from_dec("4.5");
      is(ref($x), "Math::BigInt", "class");
      is($x, "NaN", "value");
      is(refaddr($x), refaddr($q), "address");
  };
subtest '$x = Math::BigRat -> new("4.5"); $q = $x -> from_dec("4");'
  => sub {
      # this must not downgrade
      my $x = Math::BigRat -> new("4.5");
      my $q = $x -> from_dec("4");
      is(ref($x), "Math::BigRat", "class");
      is($x, "4", "value");
      is(refaddr($x), refaddr($q), "address");
  };
note "\nUpgrading and downgrading\n\n";
Math::BigInt -> upgrade("Math::BigRat");
Math::BigRat -> downgrade("Math::BigInt");
subtest '$x = Math::BigInt -> from_dec("4.5");'
  => sub {
      # this must upgrade
      my $x = Math::BigInt -> from_dec("4.5");
      is(ref($x), "Math::BigRat", "class");
      is($x, "9/2", "value");
  };
subtest '$x = Math::BigRat -> from_dec("4");'
  => sub {
      # this must downgrade
      my $x = Math::BigRat -> from_dec("4");
      is(ref($x), "Math::BigInt", "class");
      is($x, "4", "value");
  };
subtest '$x = Math::BigInt -> new("4"); $q = $x -> from_dec("4.5");'
  => sub {
      # this must upgrade
      my $x = Math::BigInt -> new("4");
      my $q = $x -> from_dec("4.5");
      is(ref($x), "Math::BigRat", "class");
      is($x, "9/2", "value");
      is(refaddr($x), refaddr($q), "address");
  };
subtest '$x = Math::BigRat -> new("4.5"); $q = $x -> from_dec("4");'
  => sub {
      # this must downgrade
      my $x = Math::BigRat -> new("4.5");
      my $q = $x -> from_dec("4");
      is(ref($x), "Math::BigInt", "class");
      is($x, "4", "value");
      is(refaddr($x), refaddr($q), "address");
  };
done_testing();