think\Cache::dec PHP Method

    public static function dec($name, $step = 1)
    {
        self::init();
        self::$writeTimes++;
        return self::$handler->dec($name, $step);
    }

 public function testStaticCall()
 {
     $this->assertTrue(Cache::set('a', 1));
     $this->assertEquals(1, Cache::get('a'));
     $this->assertEquals(2, Cache::inc('a'));
     $this->assertEquals(4, Cache::inc('a', 2));
     $this->assertEquals(4, Cache::get('a'));
     $this->assertEquals(3, Cache::dec('a'));
     $this->assertEquals(1, Cache::dec('a', 2));
     $this->assertEquals(1, Cache::get('a'));
     $this->assertNotNull(Cache::rm('a'));
     $this->assertNotNull(Cache::clear());
 }