test plan

[thomas-fossati]

Define the test plan for the crate. The document (e.g., an entry in the wiki of this repo), should contain separate sections:

• CBOR decoding
• Crypto verification
• Appraisal

Each section should describe a number of meaningful tests for functionality and should include a test description, test vector(s) and the expected outcome (i.e., success, or failure w/ reason).