#!/usr/bin/perl -w

# Test broot function (and bsqrt() function, since it is used by broot()).

# It is too slow to be simple included in bigfltpm.inc, where it would get
# executed 3 times.

# But it is better to test the numerical functionality, instead of not testing
# it at all.

use strict;
use Test::More;

BEGIN {
  plan skip_all => "requires Math::BigInt 1.997+" unless eval { require Math::BigInt && eval($Math::BigInt::VERSION) >= 1.997 };
  plan tests => 1 + 4 * 2;
}

use Math::BigFloat only => 'LTM';
use Math::BigInt;

is (Math::BigInt->config()->{lib}, 'Math::BigInt::LTM', 'LTM loaded');

my $cl = "Math::BigFloat";
my $c = "Math::BigInt";

# 2 ** 240 =
# 1766847064778384329583297500742918515827483896875618958121606201292619776

# takes way too long
#test_broot ('2','240', 8, undef,   '1073741824');
#test_broot ('2','240', 9, undef,   '106528681.3099908308759836475139583940127');
#test_broot ('2','120', 9, undef,   '10321.27324073880096577298929482324664787');
#test_broot ('2','120', 17, undef,   '133.3268493632747279600707813049418888729');

test_broot ('2','120', 8, undef,   '32768');
test_broot ('2','60', 8, undef,   '181.0193359837561662466161566988413540569');
test_broot ('2','60', 9, undef,   '101.5936673259647663841091609134277286651');
test_broot ('2','60', 17, undef,   '11.54672461623965153271017217302844672562');

sub test_broot
  {
  my ($x,$n,$y,$scale,$result) = @_;

  my $s = $scale || 'undef';
  is ($cl->new($x)->bpow($n)->broot($y,$scale),$result, "Try: $cl $x->bpow($n)->broot($y,$s) == $result");
  $result =~ s/\..*//;
  is ($c->new($x)->bpow($n)->broot($y,$scale),$result, "Try: $c $x->bpow($n)->broot($y,$s) == $result");
  }