How do we check whether a canon is complete?

A successful example tests one path. To discuss coverage, also consider:

  1. Source coverage: which provisions are included or excluded, and why?
  2. Conditions and exceptions: is there a case for each important branch?
  3. Boundaries: equality at a threshold, adjacent dates, and extreme values.
  4. Missing facts: do unknowns remain unknown?
  5. Conflicts: what happens when grounds support different conclusions?
  6. Versions: does changing the applicable edition change the answer?

Share a rule and a set of examples you trust. What additional case might reveal a gap?