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fuzzing-patterns

Use when writing fuzz tests for Solidity contracts. Covers property-based testing, input constraining with vm.assume/vm.bound, stateful vs stateless fuzzing, configuring runs, seed corpus, and interpreting counterexamples.

skills/fuzzing-patterns/SKILL.md

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# Fuzz Testing Patterns

## Stateless vs Stateful Fuzzing

| Type | How It Works | Use Case |
|------|-------------|----------|
| **Stateless** | Random inputs per test, fresh state each run | Individual function properties |
| **Stateful** | Random sequences of calls, accumulated state | System-level invariants |

Stateless = `function testFuzz_*(uint256 x)` — Foundry randomizes `x` each run.
Stateful = invariant tests with handlers (see `invariant-testing` skill).

## Basic Fuzz Test