How do I install the Testing skill?

Run npx skillmds@latest add ccusage/testing in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Testing skill do?

Guides ccusage Rust and Node tests. Use when adding or fixing cargo tests, Node test files, CLI snapshots, Claude model pricing, LiteLLM compatibility, or fixture-backed tests. It is listed under AI & ML on SkillMD.

Is Testing safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Testing?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Testing free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Testing?

ccusage (@ccusage) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Testing by ccusage — Agent Skill

Name: Testing
Author: ccusage

File contents

ccusage Testing

The tdd skill owns the Red-Green-Refactor loop and the focused runner commands. This skill owns what is specific to ccusage: fixtures, adapter coverage, pricing and model behavior, snapshots, CLI output, and package tooling.

Prefer behavior-focused tests over schema-shape tests, unless schema normalization itself is the behavior under test.
Branching behavior belongs in separate tests or table-driven cases rather than an if inside a test body.
Skipped local-data smoke tests are acceptable when real user log directories catch schema drift, as long as they pass on clean CI machines.

Rust

Unit tests sit next to the module they exercise in #[cfg(test)] mod tests. When a large module is split, its tests move with the code instead of staying in main.rs.

Read references/rust.md for fixtures, snapshots, pricing, and model names.

Node

Read references/node-test.md. Node covers only the package launcher and the Nix-side JS tooling; production CLI runtime behavior is tested in Rust.

Frequently asked questions

Testing