Add tests for POST /api/contests/:id/entry
Add tests for POST /api/contests/:id/entry

ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2