Simple one-time use credentials from a blind signature scheme. Note that this provides privacy because the Issuer never learns SN, and can’t link a Credential Show to the one it issued to a specific user.
This kind of test is also more business-oriented, because they focus on testing external, visible behaviors (so it’s kind of “BDD in code”). You don’t have to think about internal implementation details anymore. In most cases, you don’t even need mocks, it’s enough to use hand-written Test Doubles/Fakes/Stubs (e.g. an in-memory list that simulates a database, fake time provider, etc) (tests with Fakes are much cleaner).
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