function testScoreAndRankFor()
 {
     $leaderboard = new Leaderboard('leaderboard');
     for ($i = 1; $i <= 5; $i++) {
         $leaderboard->addMember("member_{$i}", $i);
     }
     $memberData = $leaderboard->scoreAndRankFor('member_1');
     $this->assertEquals('member_1', $memberData['member']);
     $this->assertEquals(1, $memberData['score']);
     $this->assertEquals(5, $memberData['rank']);
 }