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Agent skill

Parametrize Related Tests

by 0xMiden in 0xMiden/protocol

A skill your agent uses when writing two or more tests that differ only by inputs or expected outputs — collapse the duplication into parameterized cases.

MITAuto-check passedDevelopment

Install Parametrize Related Tests

skills CLI
$ npx skills add 0xMiden/protocol --skill parametrize-related-tests -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install 0xMiden/protocol parametrize-related-tests --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/parametrize-related-tests .claude/skills/parametrize-related-tests && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
parametrize-related-tests
GitHub stars
133
Token cost
~379 tokens
SKILL.md length
93 words
Files
1
Skills in repo
35
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when writing two or more tests that differ only by inputs or expected outputs — collapse the duplication into parameterized cases.

  • More tests that differ only by inputs
  • SKILL.md covers Rule, Why and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Expected outputs — collapse the duplication into parameterized cases

What it does

Parametrize Related Tests is an agent skill from 0xMiden/protocol. Use when writing two or more tests that differ only by inputs or expected outputs — collapse the duplication into parameterized cases.

Its SKILL.md is about 380 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: Core components of the Miden protocol. The licence is MIT.

When your agent uses it

  • More tests that differ only by inputs
  • Expected outputs — collapse the duplication into parameterized cases

Example prompts

  • “/parametrize-related-tests”

What it can do on your machine

Read from SKILL.md and the folder at commit 62b59ec. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are rust).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Parametrize Related Tests loads about 379 tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 93 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~40
When it runs · the whole SKILL.md, loaded when a task matches
~379

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from 0xMiden/protocol at commit 62b59ec, republished under its MIT licence (© 0xMiden). 93 words, ~379 tokens.

Download SKILL.mdSave it as .claude/skills/parametrize-related-tests/SKILL.md (or your agent's skills folder).
name
parametrize-related-tests
description
Use when writing two or more tests that differ only by inputs or expected outputs — collapse the duplication into parameterized cases.

Parameterize Repeated Tests with rstest

Rule

When you'd write two or more test functions that share their body and differ only by inputs/expected values, write a single #[rstest] function with one #[case] per input set:

rust
#[rstest]
#[case::happy("abc", true)]
#[case::empty("", false)]
#[case::too_long(LONG_INPUT, false)]
fn validate_name(#[case] input: &str, #[case] expected: bool) {
    assert_eq!(validate(input), expected);
}

This applies especially to "one test per enum variant" patterns and "one test per error condition" patterns.

Why

Copy-pasted test bodies drift — a fix in one case doesn't reach the others. Parameterized cases keep the assertion in one place, name each case in the output, and make a missing case obvious; adding one is a single line.

Examples

rust
// Good
#[rstest]
#[case::fungible(Asset::Fungible(make_fungible()), AssetKind::Fungible)]
#[case::nft(Asset::Nft(make_nft()), AssetKind::Nft)]
fn asset_kind(#[case] asset: Asset, #[case] expected: AssetKind) {
    assert_eq!(asset.kind(), expected);
}

// Bad: two test functions duplicating the body
#[test]
fn asset_kind_fungible() { assert_eq!(Asset::Fungible(make_fungible()).kind(), AssetKind::Fungible); }
#[test]
fn asset_kind_nft() { assert_eq!(Asset::Nft(make_nft()).kind(), AssetKind::Nft); }

© 0xMiden, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/parametrize-related-tests of 0xMiden/protocol.

Open the folder on GitHubat commit 62b59ec

Compare with similar skills

Parametrize Related Tests next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Parametrize Related Tests compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Parametrize Related Tests this skill0xMiden/protocol133—~379Automated safety check: PassMIT
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Parametrize Related Tests

What does Parametrize Related Tests do?

A skill your agent uses when writing two or more tests that differ only by inputs or expected outputs — collapse the duplication into parameterized cases. Parametrize Related Tests is an agent skill from 0xMiden/protocol. Use when writing two or more tests that differ only by inputs or expected outputs — collapse the duplication into parameterized cases.

When should I use Parametrize Related Tests?

Parametrize Related Tests fits situations like: more tests that differ only by inputs; expected outputs — collapse the duplication into parameterized cases.

How do I install Parametrize Related Tests in Claude Code?

Run `npx skills add 0xMiden/protocol --skill parametrize-related-tests -a claude-code`. Or copy the skill folder (.claude/skills/parametrize-related-tests in 0xMiden/protocol) into .claude/skills/parametrize-related-tests in your project. Claude Code loads it when a task matches its description.

How do I install Parametrize Related Tests in Codex?

Run `npx skills add 0xMiden/protocol --skill parametrize-related-tests -a codex`. Or copy the skill folder (.claude/skills/parametrize-related-tests in 0xMiden/protocol) into .agents/skills/parametrize-related-tests in your project. Codex loads it when a task matches its description.

Can I use Parametrize Related Tests in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add 0xMiden/protocol --skill parametrize-related-tests -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/parametrize-related-tests, .gemini/skills/parametrize-related-tests, .github/skills/parametrize-related-tests and .opencode/skills/parametrize-related-tests in your project.

What does Parametrize Related Tests need to run?

SKILL.md names no scripts, command-line tools or credentials: Parametrize Related Tests is instructions for the agent only.

Does Parametrize Related Tests access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Parametrize Related Tests safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Parametrize Related Tests use?

Parametrize Related Tests is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Parametrize Related Tests use?

About 379 tokens (SKILL.md is roughly 1.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Parametrize Related Tests?

Skills that share tags, products or a category with Parametrize Related Tests: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Parametrize Related Tests?

0xMiden (a GitHub organization) maintains it in 0xMiden/protocol, which has 133 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on October 9, 2026.

Source: 0xMiden/protocol on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.