If you going to create a repl set to test think you need atlest two members to witness replication and voting would only matter if there is more than one member.Else single node I dont think would be much different from a single mongod instance.
If you going to create a repl set to test think you need atlest two members to witness replication and voting would only matter if there is more than one member.Else single node I dont think would be much different from a single mongod instance.