---

name: rust-testing description: "Rust testing expert for unit, integration, async, property-based, concurrency, and benchmark testing workflows."---

Rust Testing Skill

Use this skill for detailed, production-ready guidance in this Rust domain.

Core Question

How do we keep tests deterministic, fast, and meaningful?

Solution Patterns

• Use unit tests for logic, integration for contracts
• Use property tests for invariants
• Use loom/criterion for concurrency/perf confidence

Workflow

1. Reproduce and isolate the issue with a minimal failing case.
2. Choose the smallest safe design that satisfies constraints.
3. Implement with explicit ownership, errors, and boundaries.
4. Verify with tests, linting, and scenario-specific checks.

Review Checklist

• Correct behavior for both success and failure paths.
• Ownership and API boundaries are explicit.
• Error handling and diagnostics are actionable.
• Performance-sensitive paths are measured.
• Regression tests cover the changed behavior.

Common Pitfalls

• Fixing flakes with sleep
• Over-mocking
• Slow tests in default CI path

Verification Commands

cargo test
cargo test -- --nocapture
cargo bench
cargo nextest run

Related Skills

• rust-concurrency

• rust-performance

• rust-database