Add test_check_user_existed_or_signup
Add test_check_user_existed_or_signup

stvreumi/electronic-blackboard,SWLBot/electronic-blackboard,chenyang14/electronic-blackboard,Billy4195/electronic-blackboard,stvreumi/electronic-blackboard,stvreumi/electronic-blackboard,SWLBot/electronic-blackboard,Billy4195/electronic-blackboard,Billy4195/electronic-blackboard,chenyang14/electronic-blackboard,SWLBot/electronic-blackboard,stvreumi/electronic-blackboard,chenyang14/electronic-blackboard,Billy4195/electronic-blackboard,SWLBot/electronic-blackboard