Verification Tests

[aljones15]

If one or more of proof.type, proof.verificationMethod, and proof.proofPurpose does not exist, an error MUST be raised and SHOULD convey an error type of PROOF_VERIFICATION_ERROR.

If expectedProofPurpose was given, and it does not match proof.proofPurpose, an error MUST be raised and SHOULD convey an error type of PROOF_VERIFICATION_ERROR.

If domain was given, and it does not contain the same strings as proof.domain (treating a single string as a set containing just that string), an error MUST be raised and SHOULD convey an error type of INVALID_DOMAIN_ERROR.

If challenge was given, and it does not match proof.challenge, an error MUST be raised and SHOULD convey an error type of INVALID_CHALLENGE_ERROR.