rust-testing

The `rust-testing` skill provides a comprehensive guide to writing robust and maintainable tests in Rust, addressing the common challenges developers face when ensuring code correctness and reliability. It focuses on implementing tests for functions, methods, and traits, supporting a variety of testing methodologies including unit tests, integration tests, async tests, property-based tests, and mocking. By following a Test-Driven Development (TDD) workflow, this skill helps developers systematically write tests before implementation, ensuring that new features and changes are validated early in the development cycle.

Key features of the skill include structured guidance on the RED-GREEN-REFACTOR cycle, step-by-step examples for writing failing tests, implementing minimal functionality to pass tests, and safely refactoring code. It also provides patterns for organizing module-level tests, leveraging assertion macros for equality, inequality, boolean conditions, float comparisons, and custom messages. Additionally, it covers advanced scenarios such as testing `Result` types for error handling, verifying panics with expected messages, mocking dependencies to isolate units under test, and measuring test coverage with tools like `cargo-llvm-cov` to ensure high confidence in code quality.

This skill is particularly useful for Rust developers looking to adopt TDD practices, improve test coverage for existing code, validate input through property-based tests, or benchmark performance-critical components. It targets both individual developers and teams aiming for reliable software delivery, providing practical examples and workflows that can be directly applied to real-world Rust projects. Whether starting new projects or maintaining existing ones, users gain a structured approach to testing that enhances code maintainability, reduces bugs, and supports continuous improvement through disciplined testing practices.