Loading: add test (#540)
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Leopoldthecoder/element-1,huguangju/element,QingWei-Li/element,Leopoldthecoder/element-1,Kingwl/element,hetian9288/elui,jsyczhanghao/element,immissile/m-element,JavascriptTips/element,hisland/element,pengchongfu/element,akirak/element,youngerheart/element,imyzf/element,pengchongfu/element,reverland/element,hisland/element,engriary/element,QingWei-Li/element,ElemeFE/element,renxia/element,hetian9288/elui,engriary/element,baiyaaaaa/element,iamnewsea/element-pzx,furybean/element,immissile/m-element,akirak/element,youngerheart/element,imyzf/element,karol-f/element,ElemeFE/element,karol-f/element,furybean/element,Raganof/element,iamnewsea/element-pzx,JavascriptTips/element,renxia/element,Kingwl/element,baiyaaaaa/element,reverland/element,Raganof/element,huguangju/element