Fuzz

What it is

Adversarial / random input testing. Seeded mutation: take a base corpus, randomly mutate, report any input that triggers an exception or violates a guard predicate.

When to use it

Robustness against weird / hostile inputs (unicode, prototype-pollution-shaped names, etc.).

Example gates

dispatcher-fuzz — found a real prototype-pollution bug on first run.

See also

• The pyramid — where this mode sits relative to the others
• Writing a gate — how to scaffold a new gate in this mode
• Decision tree — "I just wrote feature X — what tests do I owe?"