public function testCounter()
{
$cacheKey = 'test.counter';
Cache::set($cacheKey, 0);
$count = Cache::increment($cacheKey);
$this->assertEquals(1, $count);
$count = Cache::increment($cacheKey, 2);
$this->assertEquals(3, $count);
$count = Cache::decrement($cacheKey);
$this->assertEquals(2, $count);
$count = Cache::decrement($cacheKey, 2);
$this->assertEquals(0, $count);
}