use strict;
use warnings;
use FindBin qw($Bin);
use lib $Bin;
use Test::More qw(no_plan);
use Algorithm::Combinatorics qw(partitions);
use Tester;
my $tester = Tester->__new(\&partitions);
my (@result, @expected);
# ---------------------------------------------------------------------
eval { partitions() };
ok($@, '');
eval { partitions(0) };
ok($@, '');
# ---------------------------------------------------------------------
@expected = ([]);
$tester->__test(\@expected, []);
# ---------------------------------------------------------------------
@expected = ([["foo"]]);
$tester->__test(\@expected, ["foo"]);
# ---------------------------------------------------------------------
@expected = ([["foo", "bar"]], [["foo"], ["bar"]]);
$tester->__test(\@expected, ["foo", "bar"]);
# ---------------------------------------------------------------------
@expected = (
[["foo", "bar", "baz"]],
[["foo", "bar"], ["baz"]],
[["foo", "baz"], ["bar"]],
[["foo"], ["bar", "baz"]],
[["foo"], ["bar"], ["baz"]],
);
$tester->__test(\@expected, ["foo", "bar", "baz"]);
# ---------------------------------------------------------------------
@expected = (
[[qw(a b c d)]],
[[qw(a b c)], ["d"]],
[[qw(a b d)], ["c"]],
[[qw(a b)], [qw(c d)]],
[[qw(a b)], ["c"], ["d"]],
[[qw(a c d)], ["b"]],
[[qw(a c)], [qw(b d)]],
[[qw(a c)], ["b"], ["d"]],
[[qw(a d)], [qw(b c)]],
[["a"], [qw(b c d)]],
[["a"], [qw(b c)], ["d"]],
[[qw(a d)], ["b"], ["c"]],
[["a"], [qw(b d)], ["c"]],
[["a"], ["b"], [qw(c d)]],
[["a"], ["b"], ["c"], ["d"]],
);
$tester->__test(\@expected, [qw(a b c d)]);
# ---------------------------------------------------------------------
my $n = 0;
my $iter = partitions([1..9]);
while (my $p = $iter->next) {
++$n;
}
is($n, 21147, "");
$n = 0;
$iter = partitions([1..10]);
while (my $p = $iter->next) {
++$n;
}
is($n, 115975, "");