message: Add: `messageObjectValidator` helper mock
diff: @@ -9,3 +9,7 @@ export const derivationPathSerializer = jest.fn(() => 'mocked-derivation-path');
  export const transactionObjectValidator = jest.fn(
  (transactionObject = {}) => transactionObject,
  );
  +
  +export const messageObjectValidator = jest.fn(
  + (messageObject = {}) => messageObject,
  +);
  