testing(common::operation): Improve coverage #331
Description
Quite a few branches are missing from the test coverage for operation.rs.
- SignatureBundle::new
- ServiceChallenge::from(signing_key)
- Operation::validate_basic ("id must not empty...") errors, and "service_id must not be.." error
- Operation::validate_basic for AddKey, RevokeKey, SetData, and AddData
- Operation::get_public_key for RevokeKey, AddKey, RegisterService, and Add/SetData. Already called once for CreateAccount