Agent skill

Testing

Run tests, verify changes, and collect diagnostics. An agent skill from nteract/nteract.

BSD-3-ClauseAuto-check passedTesting & QA

Install Testing

skills CLI

$ npx skills add nteract/nteract --skill testing -a claude-code

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

GitHub CLI

$ gh skill install nteract/nteract testing --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/nteract/nteract.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/testing .claude/skills/testing && 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/

Paste into Claude Code

Install the "testing" agent skill from https://github.com/nteract/nteract/tree/main/.agents/skills/testing into .claude/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/nteract/nteract/tree/main/.agents/skills/testing

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add nteract/nteract --skill testing -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install nteract/nteract testing --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nteract/nteract.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/testing .agents/skills/testing && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "testing" agent skill from https://github.com/nteract/nteract/tree/main/.agents/skills/testing into .agents/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nteract/nteract --skill testing -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install nteract/nteract testing --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nteract/nteract.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/testing .cursor/skills/testing && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "testing" agent skill from https://github.com/nteract/nteract/tree/main/.agents/skills/testing into .cursor/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/nteract/nteract.git --path .agents/skills/testing

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add nteract/nteract --skill testing -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install nteract/nteract testing --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nteract/nteract.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/testing .gemini/skills/testing && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "testing" agent skill from https://github.com/nteract/nteract/tree/main/.agents/skills/testing into .gemini/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install nteract/nteract testing

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add nteract/nteract --skill testing -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/nteract/nteract.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/testing .github/skills/testing && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "testing" agent skill from https://github.com/nteract/nteract/tree/main/.agents/skills/testing into .github/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nteract/nteract --skill testing -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install nteract/nteract testing --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nteract/nteract.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/testing .opencode/skills/testing && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "testing" agent skill from https://github.com/nteract/nteract/tree/main/.agents/skills/testing into .opencode/skills/testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: testing
GitHub stars: 179
Token cost: ~2.2k tokens
SKILL.md length: 667 words
Files: 1
Skills in repo: 10
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: BSD-3-Clause

At a glance

Run tests, verify changes, and collect diagnostics. An agent skill from nteract/nteract.

Writing new tests
SKILL.md covers Quick Reference, Verification Workflow, Frontend Unit Tests (Vitest) and Rust Unit Tests, plus 6 more sections
Calls cargo, pnpm and pytest
Verifying code changes before commit

What it does

Testing is an agent skill from nteract/nteract. Run tests, verify changes, and collect diagnostics. Use when running tests, writing new tests, verifying code changes before commit, or collecting logs for debugging.

Its SKILL.md is about 2.2k 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 Testing & QA, covering Unit testing and End-to-end testing. It works with Python, pnpm and pytest. The repository describes itself as: We're back! Now firing notebooks out of a t-shirt gun. The licence is BSD-3-Clause.

When your agent uses it

Writing new tests
Verifying code changes before commit
Collecting logs for debugging

Example prompts

“/testing”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 414222e. 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
Shell commands in SKILL.md call:
- cargo
- pnpm
- pytest
- python
- pip
- deno
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pnpm and pip, which can reach the network depending on how they are called.
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

Testing loads about 2.2k tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 667 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~44
When it runs · the whole SKILL.md, loaded when a task matches: ~2.2k

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 nteract/nteract at commit 414222e, republished under its BSD-3-Clause licence (© nteract). 667 words, ~2,202 tokens.

Download SKILL.mdSave it as .claude/skills/testing/SKILL.md (or your agent's skills folder).

name: testing
description: Run tests, verify changes, and collect diagnostics. Use when running tests, writing new tests, verifying code changes before commit, or collecting logs for debugging.

Testing & Verification

Quick Reference

Type	Location	Command	Framework
Browser E2E	`apps/notebook/e2e/`	`pnpm --filter notebook-ui test:e2e:browser`	Playwright
Native E2E	`e2e/specs/`	`cargo xtask e2e test`	WebdriverIO + Mocha
Frontend unit	`src//__tests__/`, `apps/notebook/src//__tests__/`	`pnpm test`	Vitest + jsdom
Rust unit	inline `#[cfg(test)]`	`cargo test`	built-in
CLI behavior	`crates/runt/tests/*.hone`	`cargo hone test`	Hone
Python	`python/runtimed/tests/`	`pytest`	pytest

Verification Workflow

After making changes, run the narrowest credible test first, then broader checks.

Narrow Tests by Crate

Files changed	Test command
`crates/runtimed/src/**`	`cargo test -p runtimed`
`crates/notebook-wire/src/**`	`cargo test -p notebook-wire && cargo test -p notebook-protocol`
`crates/notebook-doc/src/**`	`cargo test -p notebook-doc`
`crates/notebook-protocol/src/**`	`cargo test -p notebook-protocol`
`crates/notebook-sync/src/**`	`cargo test -p notebook-sync`
`crates/kernel-env/src/**`	`cargo test -p kernel-env`
`crates/kernel-launch/src/**`	`cargo test -p kernel-launch`
`crates/runt/src/**`	`cargo test -p runt`
`crates/runt-workspace/src/**`	`cargo test -p runt-workspace`
`crates/runtimed-py/src/**`	`up rebuild=true`
`crates/runtimed-wasm/**`	`cargo xtask wasm` then `deno test --allow-read --allow-env --no-check`
`apps/notebook/src/**`	`pnpm test:run`
`python/runtimed/src/**`	`pytest python/runtimed/tests/test_session_unit.py -v`

Multiple crates: cargo test -p runtimed -p notebook-doc.

MCP Live Verification (when nteract-dev available)

For daemon/kernel changes: up rebuild=true → create_notebook → create_cell with 1 + 1 → execute_cell → verify output is 2.

For CRDT/doc changes: create_notebook → create_cell → get_cell (verify source) → set_cell → get_cell (verify update).

For kernel-env changes: up rebuild=true → create_notebook → execute import sys; print(sys.executable) → verify Python path.

Reporting verification

State which checks ran and what they established. Distinguish compilation, narrow tests, and MCP live verification; name skipped or blocked checks and the behavior they leave unverified.

For example, after narrow tests pass but a live check is unavailable:

The daemon tests passed. I couldn't run the MCP check because nteract-dev wasn't available, so live cell execution is still unverified.

Always run cargo xtask lint --fix before committing.

Frontend Unit Tests (Vitest)

Config: vitest.config.ts (jsdom environment, globals enabled).

bash

pnpm test         # Watch mode
pnpm test:run     # Run once

Key locations: src/components/isolated/__tests__/, src/components/outputs/__tests__/, src/components/widgets/__tests__/, apps/notebook/src/lib/__tests__/.

Rust Unit Tests

bash

cargo test                    # All workspace tests
cargo test -p runtimed        # Specific crate
cargo test -- --nocapture     # Show println! output

Hone CLI Tests

Declarative bash-based tests in crates/runt/tests/*.hone.

bash

cargo hone test               # All hone tests
cargo hone test cli.hone      # Specific file

Assertions: ASSERT exit_code == 0, ASSERT stdout contains "text", ASSERT stdout matches /pattern/.

Python Tests

Two venvs: workspace (.venv at root) for dev, and python/runtimed/.venv for isolated pytest.

bash

# Setup test venv
cd python/runtimed && python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"
cd ../../crates/runtimed-py && VIRTUAL_ENV=../../python/runtimed/.venv maturin develop

# Run
pytest python/runtimed/tests/test_session_unit.py -v          # Unit (no daemon)
SKIP_INTEGRATION_TESTS=1 pytest python/runtimed/tests/ -v     # Skip integration
RUNTIMED_INTEGRATION_TEST=1 pytest python/runtimed/tests/ -v  # CI mode (spawns daemon)

Browser E2E Tests

Playwright tests in apps/notebook/e2e/ are the preferred E2E surface for notebook UI, runtime, fixture, and renderer behavior. They use the Vite browser relay plus the dev daemon, avoiding the slower Tauri WebDriver app build.

bash

pnpm --filter notebook-ui test:e2e:browser -- --project=chromium
pnpm --filter notebook-ui test:e2e:browser -- --project=chromium apps/notebook/e2e/execute-cell-output.spec.ts
pnpm --filter notebook-ui test:e2e:browser:portless -- --project=chromium

Native E2E Tests

Native WebDriverIO tests should stay focused on Tauri-specific setup: app shell boot, cwd-derived untitled notebook behavior, launcher/bootstrap behavior, and other issues that require the real Tauri process.

Running

bash

cargo xtask e2e build       # Build with WebDriver support (required first)
cargo xtask e2e test        # Native smoke/default run
cargo xtask e2e test-all    # Native smoke plus long-tail Tauri fixtures
cargo xtask e2e test-fixture <notebook> <spec>  # Single fixture test

Show full SKILL.md (279 more words)Show less

Adding Tests

Fixture test: Create notebook in crates/notebook/fixtures/audit-test/, create spec in e2e/specs/, add to FIXTURE_SPECS in e2e/wdio.conf.js, add to crates/xtask/src/main.rs, add to CI.

Regular test: Create a spec in e2e/specs/. It is picked up automatically if not in FIXTURE_SPECS.

Helpers (e2e/helpers.js)

Helper	Purpose
`waitForAppReady()`	Waits for toolbar (15s). Use in every `before()` hook
`waitForKernelReady()`	Waits for kernel idle/busy (60s). Superset of above
`executeFirstCell()`	Focuses first code cell, Shift+Enter
`waitForCellOutput(cell)`	Waits for stream output
`waitForOutputContaining(cell, text)`	Waits for specific output text
`approveTrustDialog()`	Clicks "Trust & Install"
`typeSlowly(text)`	Character-by-character (30ms). Required for CodeMirror
`setupCodeCell()`	Finds/creates code cell, focuses editor, selects all

wry WebDriver Constraints

Use data-testid attributes. Text selectors return broken refs.
Use browser.execute() + browser.waitUntil(). executeAsync() is unsupported.
Use typeSlowly() for CodeMirror. Fast input drops characters.
Use browser.execute() for iframe testing. switchToFrame() is broken.

Selectors

data-testid: notebook-toolbar, save-button, add-code-cell-button, add-markdown-cell-button, start-kernel-button, restart-kernel-button, interrupt-kernel-button, run-all-button, deps-toggle, trust-dialog, trust-approve-button, deps-panel, deps-add-input.

data-slot: output-area, ansi-stream-output, ansi-error-output.

Other: [data-cell-type="code"], [data-cell-type="markdown"], .cm-content[contenteditable="true"], iframe[sandbox].

Diagnostics

Collecting

Use env -i for system diagnostics to avoid dev env vars (RUNTIMED_DEV, RUNTIMED_WORKSPACE_PATH) leaking through. env -i also clears PATH, so use the installed nteract link (~/.local/bin by default) and --channel to pick the installation.

bash

# Nightly (system)
env -i HOME=$HOME "$HOME/.local/bin/nteract" --channel nightly diagnostics

# Stable (system)
env -i HOME=$HOME "$HOME/.local/bin/nteract" --channel stable diagnostics

# Dev daemon (no env -i needed)
RUNTIMED_DEV=1 RUNTIMED_WORKSPACE_PATH="$(pwd)" ./target/debug/runt diagnostics

Other system commands follow the same env -i pattern:

bash

env -i HOME=$HOME "$HOME/.local/bin/nteract" --channel nightly daemon status
env -i HOME=$HOME "$HOME/.local/bin/nteract" --channel nightly daemon logs -f
env -i HOME=$HOME "$HOME/.local/bin/nteract" --channel stable ps

Read files from tarball without extracting:

bash

tar xzf <archive>.tar.gz -O doctor.json
tar xzf <archive>.tar.gz -O runtimed.log | grep -i 'error\|panic'

What to Look For

Ghost windows: Context for '...' missing in notebook.log
Daemon crashes: Check runtimed.log.1 (previous session)
Upgrade failures: Search [upgrade] in notebook.log
Kernel issues: Search [daemon-kernel] or kernel_status
Sync errors: Search [notebook-sync] or daemon:disconnected
Frontend errors: webview:error or webview:warn in notebook.log
launchd issues: Check doctor.json launchd_service status

Test Philosophy

Prefer fast integration tests over slow E2E. Use E2E for critical user journeys, integration tests for daemon behavior, unit tests for algorithms.

Files

Just SKILL.md in .agents/skills/testing of nteract/nteract.

Open the folder on GitHubat commit 414222e

Compare with similar skills

Testing 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.

Testing compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Testing this skillnteract/nteract	179	—	~2.2k	Automated safety check: Pass	BSD-3-Clause	today
Python Testing Patternsjh941213/my-cc-harness	126	17 repos	~5.4k	Automated safety check: Pass	None	2 mo ago
Specx Testsmaksimzayats/specx	202	—	~1.9k	Automated safety check: Pass	MIT	2 mo ago
Python Testingmacalbert/envilder	138	—	~3.1k	Automated safety check: Pass	MIT	3 days ago
Testing Patternssoftspark/ai-toolkit	179	—	~1.6k	Automated safety check: Pass	Apache-2.0	yesterday
Testing Pyericrisco/rsc-harness	167	—	~3.2k	Automated safety check: Pass	MIT	today

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Questions about Testing

What does Testing do?

Run tests, verify changes, and collect diagnostics. An agent skill from nteract/nteract. Testing is an agent skill from nteract/nteract. Run tests, verify changes, and collect diagnostics.

When should I use Testing?

Testing fits situations like: writing new tests; verifying code changes before commit; collecting logs for debugging.

How do I install Testing in Claude Code?

Run `npx skills add nteract/nteract --skill testing -a claude-code`. Or copy the skill folder (.agents/skills/testing in nteract/nteract) into .claude/skills/testing in your project. Claude Code loads it when a task matches its description.

How do I install Testing in Codex?

Run `npx skills add nteract/nteract --skill testing -a codex`. Or copy the skill folder (.agents/skills/testing in nteract/nteract) into .agents/skills/testing in your project. Codex loads it when a task matches its description.

Can I use Testing 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 nteract/nteract --skill testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/testing, .gemini/skills/testing, .github/skills/testing and .opencode/skills/testing in your project.

What does Testing need to run?

Going by SKILL.md and its folder, Testing needs the command-line tools its instructions call (cargo, pnpm, pytest, python, pip and deno). Our summary lists: Python 3.

Does Testing access the network?

SKILL.md contains no URLs. Its commands use pip, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Testing 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 Testing use?

Testing is published under the BSD-3-Clause licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Testing use?

About 2.2k tokens (SKILL.md is roughly 8.8k 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 Testing?

Skills that share tags, products or a category with Testing: Python Testing Patterns (jh941213/my-cc-harness, 126 stars), Specx Tests (maksimzayats/specx, 202 stars), Python Testing (macalbert/envilder, 138 stars) and Testing Patterns (softspark/ai-toolkit, 179 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Testing?

nteract (a GitHub organization) maintains it in nteract/nteract, which has 179 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on October 7, 2026.

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

Install Testing

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Testing & Verification

Quick Reference

Verification Workflow

Narrow Tests by Crate

MCP Live Verification (when nteract-dev available)

Reporting verification

Frontend Unit Tests (Vitest)

Rust Unit Tests

Hone CLI Tests

Python Tests

Browser E2E Tests

Native E2E Tests

Running

Adding Tests

Helpers (e2e/helpers.js)

wry WebDriver Constraints

Selectors

Diagnostics

Collecting

What to Look For

Test Philosophy

Files

Compare with similar skills

Similar skills

More from nteract/nteract

Related

Questions about Testing