Better organize `TestGitHubIssues`.
Better organize `TestGitHubIssues`.

PyMySQL/Tornado-MySQL,PyMySQL/PyMySQL,lzedl/PyMySQL,anson-tang/PyMySQL,wraziens/PyMySQL,NunoEdgarGub1/PyMySQL,boneyao/PyMySQL,jwjohns/PyMySQL,eibanez/PyMySQL,eibanez/PyMySQL,xjzhou/PyMySQL,modulexcite/PyMySQL,mosquito/Tornado-MySQL,jheld/PyMySQL,nju520/PyMySQL,MartinThoma/PyMySQL,xjzhou/PyMySQL,pulsar314/Tornado-MySQL,yeyinzhu3211/PyMySQL,Ting-y/PyMySQL,pymysql/pymysql,yeyinzhu3211/PyMySQL,Geoion/Tornado-MySQL,methane/PyMySQL,aio-libs/aiomysql,DashaChuk/PyMySQL,wraziens/PyMySQL,lzedl/PyMySQL