Add test case for mapping Java void/Void to Unit
Add test case for mapping Java void/Void to Unit

bixuanzju/fcore,hkuplg/fcore,zhiyuanshi/fcore,wxzh/fcore,bixuanzju/fcore,xnning/fcore,bixuanzju/fcore,xnning/fcore,wxzh/fcore,zhiyuanshi/fcore,wxzh/fcore,hkuplg/fcore,xnning/fcore,zhiyuanshi/fcore,hkuplg/fcore