function testRandom()
 {
     $l = new Loop('foo', 'bar', 'charlie');
     $arr = array('foo', 'bar', 'charlie');
     $this->true(in_array($l->rand(), $arr));
     $this->true(in_array($l->rand(), $arr));
     $this->true(in_array($l->rand(), $arr));
     $this->true(in_array($l->rand(), $arr));
 }