Official agent skill

Testing Patterns

by langchain-ai in langchain-ai/skills-benchmarks

Unit testing and integration testing best practices. An agent skill from langchain-ai/skills-benchmarks.

OfficialMITAuto-check passedTesting & QA

Install Testing Patterns

skills CLI

$ npx skills add langchain-ai/skills-benchmarks --skill testing-patterns -a claude-code

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

GitHub CLI

$ gh skill install langchain-ai/skills-benchmarks testing-patterns --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/langchain-ai/skills-benchmarks.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/noise/testing_patterns .claude/skills/testing-patterns && 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-patterns" agent skill from https://github.com/langchain-ai/skills-benchmarks/tree/main/skills/noise/testing_patterns into .claude/skills/testing-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-patterns", 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/langchain-ai/skills-benchmarks/tree/main/skills/noise/testing_patterns

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 langchain-ai/skills-benchmarks --skill testing-patterns -a codex

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

GitHub CLI

$ gh skill install langchain-ai/skills-benchmarks testing-patterns --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/langchain-ai/skills-benchmarks.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/noise/testing_patterns .agents/skills/testing-patterns && 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-patterns" agent skill from https://github.com/langchain-ai/skills-benchmarks/tree/main/skills/noise/testing_patterns into .agents/skills/testing-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-patterns", 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 langchain-ai/skills-benchmarks --skill testing-patterns -a cursor

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

GitHub CLI

$ gh skill install langchain-ai/skills-benchmarks testing-patterns --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/langchain-ai/skills-benchmarks.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/noise/testing_patterns .cursor/skills/testing-patterns && 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-patterns" agent skill from https://github.com/langchain-ai/skills-benchmarks/tree/main/skills/noise/testing_patterns into .cursor/skills/testing-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-patterns", 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/langchain-ai/skills-benchmarks.git --path skills/noise/testing_patterns

--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 langchain-ai/skills-benchmarks --skill testing-patterns -a gemini-cli

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

GitHub CLI

$ gh skill install langchain-ai/skills-benchmarks testing-patterns --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/langchain-ai/skills-benchmarks.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/noise/testing_patterns .gemini/skills/testing-patterns && 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-patterns" agent skill from https://github.com/langchain-ai/skills-benchmarks/tree/main/skills/noise/testing_patterns into .gemini/skills/testing-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-patterns", 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 langchain-ai/skills-benchmarks testing-patterns

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 langchain-ai/skills-benchmarks --skill testing-patterns -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/langchain-ai/skills-benchmarks.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/noise/testing_patterns .github/skills/testing-patterns && 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-patterns" agent skill from https://github.com/langchain-ai/skills-benchmarks/tree/main/skills/noise/testing_patterns into .github/skills/testing-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-patterns", 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 langchain-ai/skills-benchmarks --skill testing-patterns -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 langchain-ai/skills-benchmarks testing-patterns --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/langchain-ai/skills-benchmarks.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/noise/testing_patterns .opencode/skills/testing-patterns && 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-patterns" agent skill from https://github.com/langchain-ai/skills-benchmarks/tree/main/skills/noise/testing_patterns into .opencode/skills/testing-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "testing-patterns", 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-patterns
GitHub stars: 118
Token cost: ~447 tokens
SKILL.md length: 37 words
Files: 1
Skills in repo: 8
Repo updated: Sep 21, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Unit testing and integration testing best practices. An agent skill from langchain-ai/skills-benchmarks.

Tasks that involve Test strategy
SKILL.md covers Test Structure (AAA Pattern), Mocking External Services, Fixtures and Factories and Integration Tests, plus 1 more section
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Tasks that involve Integration testing

What it does

Testing Patterns is an agent skill from langchain-ai/skills-benchmarks, published by the product's own GitHub organization. Unit testing and integration testing best practices

Its SKILL.md is about 450 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 Test strategy, Integration testing and Unit testing. The licence is MIT.

When your agent uses it

Tasks that involve Test strategy
Tasks that involve Integration testing
Tasks that involve Unit testing

Example prompts

“/testing-patterns”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 9195f8c. 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 python).
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

Testing Patterns loads about 447 tokens when it runs. Until then it costs about 17 tokens; SKILL.md has 37 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~17
When it runs · the whole SKILL.md, loaded when a task matches: ~447

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 langchain-ai/skills-benchmarks at commit 9195f8c, republished under its MIT licence (© langchain-ai). 37 words, ~447 tokens.

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

name: testing-patterns
description: Unit testing and integration testing best practices

Testing Patterns

Write effective, maintainable tests using modern patterns.

Test Structure (AAA Pattern)

python

def test_user_registration():
    # Arrange
    user_data = {"email": "test@example.com", "password": "secure123"}

    # Act
    result = register_user(user_data)

    # Assert
    assert result.success is True
    assert result.user.email == "test@example.com"

Mocking External Services

python

from unittest.mock import Mock, patch

@patch('services.email.send_email')
def test_sends_welcome_email(mock_send):
    mock_send.return_value = True

    register_user({"email": "test@example.com"})

    mock_send.assert_called_once_with(
        to="test@example.com",
        template="welcome"
    )

Fixtures and Factories

python

import pytest
from factories import UserFactory

@pytest.fixture
def user():
    return UserFactory.create(role="admin")

@pytest.fixture
def authenticated_client(user):
    client = TestClient(app)
    client.login(user)
    return client

def test_admin_dashboard(authenticated_client):
    response = authenticated_client.get("/admin")
    assert response.status_code == 200

Integration Tests

python

@pytest.mark.integration
def test_full_checkout_flow(db_session, stripe_mock):
    # Create test data
    user = create_user()
    product = create_product(price=100)

    # Execute flow
    cart = add_to_cart(user, product)
    order = checkout(cart, payment_method="card")

    # Verify
    assert order.status == "completed"
    assert stripe_mock.charges.create.called

Test Coverage Goals

Unit tests: 80%+ coverage
Integration tests: Critical paths
E2E tests: Happy paths only

Files

Just SKILL.md in skills/noise/testing_patterns of langchain-ai/skills-benchmarks.

Open the folder on GitHubat commit 9195f8c

Compare with similar skills

Testing Patterns 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 Patterns compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Testing Patterns this skilllangchain-ai/skills-benchmarks	118	—	~447	Automated safety check: Pass	MIT	16 days ago
Abp Testingabpframework/abp	14k	—	~1.7k	Automated safety check: Pass	LGPL-3.0	today
Testing Patternsaiskillstore/marketplace	430	1 repos	~1k	Automated safety check: Notes	None	today
Assessing Test Coveragebitwarden/ai-plugins	154	—	~1.1k	Automated safety check: Pass	Custom licence	today
Testing QAaiskillstore/marketplace	430	3 repos	~1.2k	Automated safety check: Pass	None	today
Test Experteinverne/dotfiles	121	—	~2.3k	Automated safety check: Pass	GPL-3.0	29 days ago

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Questions about Testing Patterns

What does Testing Patterns do?

Unit testing and integration testing best practices. An agent skill from langchain-ai/skills-benchmarks. Testing Patterns is an agent skill from langchain-ai/skills-benchmarks, published by the product's own GitHub organization.

When should I use Testing Patterns?

Testing Patterns fits situations like: tasks that involve Test strategy; tasks that involve Integration testing; tasks that involve Unit testing.

How do I install Testing Patterns in Claude Code?

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

How do I install Testing Patterns in Codex?

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

Can I use Testing Patterns 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 langchain-ai/skills-benchmarks --skill testing-patterns -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-patterns, .gemini/skills/testing-patterns, .github/skills/testing-patterns and .opencode/skills/testing-patterns in your project.

What does Testing Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: Testing Patterns is instructions for the agent only. Our summary lists: Python 3.

Does Testing Patterns 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 Testing Patterns 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 Patterns use?

Testing Patterns 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 Testing Patterns use?

About 447 tokens (SKILL.md is roughly 1.8k 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 Patterns?

Skills that share tags, products or a category with Testing Patterns: Abp Testing (abpframework/abp, 14k stars), Testing Patterns (aiskillstore/marketplace, 430 stars), Assessing Test Coverage (bitwarden/ai-plugins, 154 stars) and Testing QA (aiskillstore/marketplace, 430 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Testing Patterns?

langchain-ai (a GitHub organization, an official publisher) maintains it in langchain-ai/skills-benchmarks, which has 118 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on September 21, 2026.

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

Testing Patterns

Install Testing Patterns

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 Patterns

Test Structure (AAA Pattern)

Mocking External Services

Fixtures and Factories

Integration Tests

Test Coverage Goals

Files

Compare with similar skills

Similar skills

Abp Testing

Testing Patterns

Assessing Test Coverage

Testing QA

Test Expert

Recommending Test Layers

More from langchain-ai/skills-benchmarks

Framework Selection

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React Components

API Docs

Database Migrations

Questions about Testing Patterns

Install Testing Patterns

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 Patterns

Test Structure (AAA Pattern)

Mocking External Services

Fixtures and Factories

Integration Tests

Test Coverage Goals

Files

Compare with similar skills

Similar skills

More from langchain-ai/skills-benchmarks

Related

Questions about Testing Patterns