#!perl

use strict;
use warnings;

use Test::More tests => 858;

my $class;

BEGIN {
    $class = 'Math::BigInt';
    use_ok($class);
}

can_ok($class, 'backermann', 'ackermann');

while (<DATA>) {
    s/#.*$//;                   # remove comments
    s/\s+$//;                   # remove trailing whitespace
    next unless length;         # skip empty lines

    my ($m, $n, $expected) = split /:/;

    # backermann() modifies the invocand.

    {
        my ($x, $y);
        my $test = qq|\$x = $class->new("$m"); \$y = \$x->backermann("$n");|;

        subtest $test,
          sub {
              plan tests => 4;

              eval $test;
              is($@, "", "'$test' gives emtpy \$\@");

              is(ref($y), $class,
                 "'$test' output arg is a $class");

              is($y -> bstr(), $expected,
                 "'$test' output arg has the right value");

              is($x -> bstr(), $expected,
                 "'$test' invocand has the right value");
          };
    }

    # ackermann() does not modify the invocand.

    {
        my ($x, $y);
        my $test = qq|\$x = $class->new("$m"); \$y = \$x->ackermann("$n");|;

        subtest $test,
          sub {
              plan tests => 4;

              eval $test;
              is($@, "", "'$test' gives emtpy \$\@");

              is(ref($y), $class,
                 "'$test' output arg is a $class");

              is($y -> bstr(), $expected,
                 "'$test' output arg has the right value");

              is($x -> bstr(), $m,
                 "'$test' invocand has the right value");
          };
    }
}

__DATA__

0:0:1
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0:100:101
0:1000:1001
0:100000:100001
0:10000000:10000001
0:10000000000:10000000001
0:10000000000000:10000000000001
0:10000000000000000000000000000000000:10000000000000000000000000000000001
0:12345678987654321012345678987654321:12345678987654321012345678987654322

1:0:2
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1:1000:1002
1:100000:100002
1:10000000:10000002
1:10000000000:10000000002
1:10000000000000:10000000000002
1:10000000000000000000000000000000000:10000000000000000000000000000000002
1:12345678987654321012345678987654321:12345678987654321012345678987654323

2:0:3
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2:3:9
2:4:11
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2:10000000:20000003
2:10000000000:20000000003
2:10000000000000:20000000000003
2:10000000000000000000000000000000000:20000000000000000000000000000000003
2:12345678987654321012345678987654321:24691357975308642024691357975308645

3:0:5
3:1:13
3:2:29
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3:4:125
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3:6:509
3:7:1021
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3:9:4093
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3:59:4611686018427387901
3:60:9223372036854775805
3:61:18446744073709551613
3:62:36893488147419103229
3:63:73786976294838206461
3:64:147573952589676412925
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3:67:1180591620717411303421
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3:77:1208925819614629174706173
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3:80:9671406556917033397649405
3:81:19342813113834066795298813
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3:83:77371252455336267181195261
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3:85:309485009821345068724781053
3:86:618970019642690137449562109
3:87:1237940039285380274899124221
3:88:2475880078570760549798248445
3:89:4951760157141521099596496893
3:90:9903520314283042199192993789
3:91:19807040628566084398385987581
3:92:39614081257132168796771975165
3:93:79228162514264337593543950333
3:94:158456325028528675187087900669
3:95:316912650057057350374175801341
3:96:633825300114114700748351602685
3:97:1267650600228229401496703205373
3:98:2535301200456458802993406410749
3:99:5070602400912917605986812821501
3:100:10141204801825835211973625643005

4:0:13
4:1:65533

5:0:65533