function testRankFor()
 {
     $leaderboard = new Leaderboard('leaderboard');
     for ($i = 1; $i <= Leaderboard::DEFAULT_PAGE_SIZE + 1; $i++) {
         $leaderboard->addMember("member_{$i}", $i);
     }
     $this->assertEquals(26, $leaderboard->rankFor('member_1'));
     $this->assertEquals(25, $leaderboard->rankFor('member_1', true));
 }