Claude Code parametrize-related-tests skill for rstest cases

Replace Rust tests that share their setup and assertions with named parameter cases when the values are the only difference.

Install in Claude Code

A Rust project using rstest and Claude Code. Prepare the shared behavior and input-output pairs.

Review `.claude/skills/parametrize-related-tests/SKILL.md` and its requirements at the pinned GitHub commit.
Create `.claude/skills/parametrize-related-tests/` in your project and save the reviewed file as `.claude/skills/parametrize-related-tests/SKILL.md`.
Start Claude Code from that project's root, then select `/parametrize-related-tests` in the slash menu.

Example task

Invoke /parametrize-related-tests and consolidate these fictional label-validation cases into one test function.
fixture `rack label validation` | same assertion body for every case
`valid_rack` input `Rack7` expects `true`
`punctuation` input `Rack!` expects `false`
`lowercase_prefix` input `rack7` expects `false`

What to check

Use `#[rstest]` with a shared assertion. Keep `valid_rack`, `punctuation`, and `lowercase_prefix` with `true`, `false`, and `false`, respectively.

Original SKILL.md on GitHub · Updated 2026-11-14

Frequently asked question

When should I combine test functions?

Combine cases that differ only in input or expected value. Keep distinct behaviors separate.

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