Guide · Agent skill
How to use the Rust testing patterns agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The rust-testing skill is a written guide that an AI agent reads when it works on Rust code, so it follows a consistent set of testing practices. It is aimed at Rust developers who want test-first habits, and at teams adding tests to existing Rust code. After this guide you will know how to install the skill, how to ask for it in plain language, and what the agent is likely to do differently.
Rust Testing Patternsaffaan-m/ECC · MIT Download the skill Quick start
- 1Download the ZIP. Download the rust-testing skill ZIP from this page.
- 2Unzip the folder. Unzip the file so you have a folder containing SKILL.md.
- 3Place the skill. Move the folder to ~/.claude/skills/ for personal use, or to .claude/skills/ in your project.
- 4Or upload in the apps. In the Claude apps, open Settings, then Capabilities, then Skills, and upload the skill.
- 5Make a Rust request. Ask for a Rust function or test task and mention testing or TDD in plain language.
- 6Check the result. Review the tests the agent writes and run cargo test to confirm them.
What the skill makes the agent do
When the skill is installed, the agent follows the testing practices documented in its SKILL.md file. The guide covers writing tests first in a red, green, refactor cycle, organising unit tests in a #[cfg(test)] module and integration tests in a tests/ folder, testing Result errors and panics, running async tests with Tokio, parameterised tests with rstest, and property-based tests with proptest.
For mocking, the guide suggests mockall to isolate dependencies, and it asks for coverage to be checked with cargo-llvm-cov against an 80% target.
Install the skill from the ZIP
Download the ZIP file for the skill from this page, then unzip it. The skill is a folder containing SKILL.md. Place that folder in one of these locations:
- Personal skills folder: ~/.claude/skills/
- Project skills folder: .claude/skills/ inside your project
Or upload it in the Claude apps
If you use the Claude apps rather than local folders, open Settings, go to Capabilities, then Skills, and upload the skill there.
How to trigger the skill with natural requests
You do not need a special command. Describe the Rust task in plain language and mention testing. The skill's description matches requests about Rust unit, integration, async, property-based, mocking and coverage work, and TDD.
The skill's own use cases list writing new functions, methods or traits in Rust, adding test coverage to existing code, implementing property-based tests for input validation, and following a TDD workflow in Rust projects.
- Write a Rust function to parse this config, test first using TDD.
- Add tests to this existing Rust module and check coverage.
- Write property-based tests with proptest for my email validation.
- Mock the database trait in these service tests with mockall.
What you need before you start
The examples are Rust-only, so you need a Rust toolchain with cargo installed. The guide references these crates: rstest, proptest, mockall, tokio for async tests, and cargo-llvm-cov for coverage. The skill runs no scripts of its own and makes no network use; it is a written guide with code examples.
cargo testSafety notes: scripts and network
According to its documentation, this skill runs no scripts and uses no network. The only file is SKILL.md. The code in it is example code to show the agent patterns; the crates it names are separate dependencies you add to your own project and that you control.
Tips for getting the best results
State whether you want the TDD cycle followed, since the guide centres on writing a failing test first. If your project already has a testing convention, tell the agent so, because the guide may otherwise push its own style.
- Name the crates you want used, for example rstest for parameterised cases.
- Ask for coverage checks with cargo-llvm-cov when you want to see progress against the 80% target.
What people use it for
- Writing a new Rust function test-first, starting with a failing test and then the minimal implementation.
- Adding unit tests for error cases using Result checks and should_panic.
- Creating async tests with Tokio for code that calls asynchronous services.
- Generating parameterised tests with rstest for many input cases.
- Adding property-based tests with proptest to validate inputs like emails.
Frequently asked questions
How do I install the rust-testing agent skill?
Download the ZIP from this page and unzip it. Put the folder in ~/.claude/skills/ for personal use or in .claude/skills/ inside your project. In the Claude apps, you can instead upload it under Settings, then Capabilities, then Skills.
What do I need to use this skill?
You need a Rust toolchain with cargo. The examples reference rstest, proptest, mockall, tokio for async tests, and cargo-llvm-cov for coverage.
Is the rust-testing skill free?
The skill is listed under the MIT licence. Check the licence file in the source repository for the terms that apply to you.
Does the skill run scripts or use the network?
No. According to its documentation, it runs no scripts and uses no network. It contains only a SKILL.md guide with code examples.
Can I use this skill for non-Rust projects?
No. The examples only apply to Rust, so there is no reason to install it for other languages.
Why is the agent not following my existing test style?
The guide may push its own patterns. If your project has an established testing convention, state it clearly in your request, or remove the skill from that project.
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Our verdict
Use this skill if you write Rust and want the agent to follow test-first habits, use rstest, proptest and mockall, and check coverage against 80%. Skip it for non-Rust projects, or for codebases with a firmly established testing convention that these patterns would conflict with.
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