Error Codes for GetSigningURL API call.

Hey 
How do I generate the below two error codes, this is for my negative testing scenarios and to prevent the below error code to occur.

The API is -- GET /agreements/{agreementId}/signingUrls" API call. The  error codes are below:

1. 404 :AGREEMENT_NOT_VISIBLE: The agreement is not visible to this user for signing.
   
   
2. 404 :AGREEMENT_NOT_EXPOSED: The agreement has not yet been exposed to the requested participant. 
   
   Thanks