test-coverage-advisor

Test coverage analysis examines your existing Rust tests against source code to reveal gaps in success paths, error handling, edge cases, and async scenarios. This Skill scans your repository to pinpoint untested code branches and suggests concrete test templates you can implement immediately.

Common coverage gaps include error path tests for Result and Option variants, boundary cases like empty collections and maximum values, async function behavior under concurrent load, and table-driven test patterns. This Skill identifies these specific gaps and provides templates tailored to your codebase.

Async test coverage requires patterns that verify concurrent execution, timeout handling, and cancellation behavior. This Skill suggests async-specific test templates and integration patterns compatible with cargo-nextest, ensuring your async code behaves correctly under real concurrency conditions.

Yes. This Skill is optimized for cargo-nextest, Rust's modern test runner, and provides test templates that integrate seamlessly with it. Running your suggested tests through cargo-nextest gives accurate coverage metrics and faster test execution.

You need a Rust repository with existing source code and test modules. This Skill uses Grep and Glob to locate and read your code and tests, then generates coverage suggestions without requiring additional tooling or configuration beyond a standard Rust project.

Error path testing ensures your error handling logic actually executes and behaves correctly. Testing error variants, recovery mechanisms, and edge cases separately from happy-path tests prevents production failures and ensures robust error handling in your Rust applications.