rust-testing-verification

Property-based testing with proptest generates diverse inputs automatically to uncover edge cases and invariants in your Rust code. Define properties your code must satisfy, and proptest finds counterexamples by running hundreds of randomized test cases against your implementation.

Fuzzing with cargo-fuzz stresses your code with randomly mutated inputs over many iterations, excelling at discovering crashes and undefined behavior in parsers and APIs. Unit tests verify specific behaviors; fuzzing finds what breaks under unexpected input patterns.

Use Criterion to benchmark critical code paths with statistical rigor, generating detailed reports that quantify performance changes across runs. Criterion automates variance analysis so you catch real regressions, not noise.

Miri interprets your Rust code to catch undefined behavior in unsafe blocks that regular compilation misses. Run your tests under Miri to validate memory safety assumptions before shipping.

Contract testing applies varied inputs to trait implementations to verify they uphold their documented behavior. Combined with property-based testing, it ensures trait implementations remain consistent across different scenarios.

Each technique addresses different concerns: property-based testing finds invariant violations, fuzzing discovers crashes, benchmarking measures performance, contract testing validates traits, and Miri catches undefined behavior. Use the ones matching your correctness and performance requirements.