Add image, voice and video field test cases
Add image, voice and video field test cases

navcat/wechatpy,jxtech/wechatpy,cysnake4713/wechatpy,Luckyseal/wechatpy,tdautc19841202/wechatpy,Luckyseal/wechatpy,cloverstd/wechatpy,chenjiancan/wechatpy,zhaoqz/wechatpy,cysnake4713/wechatpy,zaihui/wechatpy,mruse/wechatpy,tdautc19841202/wechatpy,wechatpy/wechatpy,zaihui/wechatpy,mruse/wechatpy,hunter007/wechatpy,messense/wechatpy,Dufy/wechatpy,EaseCloud/wechatpy,hunter007/wechatpy,tdautc19841202/wechatpy,cysnake4713/wechatpy,EaseCloud/wechatpy,navcat/wechatpy,cloverstd/wechatpy,Luckyseal/wechatpy,chenjiancan/wechatpy,zhaoqz/wechatpy,Dufy/wechatpy