think\Config::reset PHP Method

    public static function reset($range = '')
    {
        $range = $range ?: self::$range;
        if (true === $range) {
            self::$config = [];
        } else {
            self::$config[$range] = [];
        }
    }

 public function testConfig()
 {
     App::run();
     $this->assertTrue(Config::has('url_route_on'));
     $this->assertEquals(1, Config::get('url_route_on'));
     Config::set('url_route_on', false);
     $this->assertEquals(0, Config::get('url_route_on'));
     Config::range('test');
     $this->assertFalse(Config::has('url_route_on'));
     Config::reset();
 }