public function testSetClearTime()
 {
     $start = TimeHelper::getTime();
     $this->assertNotEqual($start, 4179);
     TimeHelper::setTime(4179);
     $now = TimeHelper::getTime();
     $this->assertEqual(4179, $now);
     TimeHelper::clearTime();
     $now = TimeHelper::getTime();
     $this->assertNotEqual(4179, $now);
 }