use Set::Scalar;
print "1..19\n";
my $a = Set::Scalar->new("a".."e");
my $b = Set::Scalar->new("c".."g");
my $d = $a->union($b);
print "not " unless $d eq "(a b c d e f g)";
print "ok 1\n";
print "not " unless $a eq "(a b c d e)";
print "ok 2\n";
print "not " unless $b eq "(c d e f g)";
print "ok 3\n";
my $e = $a + $b;
print "not " unless $e eq "(a b c d e f g)";
print "ok 4\n";
print "not " unless $a eq "(a b c d e)";
print "ok 5\n";
print "not " unless $b eq "(c d e f g)";
print "ok 6\n";
my $f = $b->union($a);
print "not " unless $f eq "(a b c d e f g)";
print "ok 7\n";
print "not " unless $a eq "(a b c d e)";
print "ok 8\n";
print "not " unless $b eq "(c d e f g)";
print "ok 9\n";
my $g = $b + $a;
print "not " unless $g eq "(a b c d e f g)";
print "ok 10\n";
print "not " unless $a eq "(a b c d e)";
print "ok 11\n";
print "not " unless $b eq "(c d e f g)";
print "ok 12\n";
my $h = $a + "x";
print "not " unless $h eq "(a b c d e x)";
print "ok 13\n";
print "not " unless $a eq "(a b c d e)";
print "ok 14\n";
my $i = "y" + $a;
print "not " unless $i eq "(a b c d e y)";
print "ok 15\n";
print "not " unless $a eq "(a b c d e)";
print "ok 16\n";
{
# Josh@allDucky.com
my $x = new Set::Scalar(1,2,3);
my $y = new Set::Scalar(1,2,3,5);
my $u = $x->union($y);
$u->insert(4);
print "not " unless $x eq "(1 2 3)";
print "ok 17\n";
print "not " unless $u eq "(1 2 3 4 5)";
print "ok 18\n";
print "not " unless $y eq "(1 2 3 5)";
print "ok 19\n";
}