public function testUnique()
{
$set = new Set();
$set->add('hello', 'world', 'hello', 'hello', '!', 'world');
$expected = 'helloworld!';
$this->assertEquals($expected, $set->unique()->join(''));
$set = new Set(array(array(1, 2, 3), array(3), array(3, 5, 5), array(1), array(1, 2)));
$newSet = $set->unique(function ($a, $b) {
return \count($a) === \count($b);
});
$this->assertCount(3, $newSet);
}
