public function testUniqueId()
 {
     // docs
     $this->assertEquals(0, __::uniqueId());
     $this->assertEquals('stooge_1', __::uniqueId('stooge_'));
     $this->assertEquals(2, __::uniqueId());
     // from js
     $ids = array();
     $i = 0;
     while ($i++ < 100) {
         array_push($ids, __::uniqueId());
     }
     $this->assertEquals(count($ids), count(__::uniq($ids)));
     // extra
     $this->assertEquals('stooges', join('', __::first(__::uniqueId('stooges'), 7)), 'prefix assignment works');
 }