Agent skill

Python Testing

Python testing patterns with pytest, fixtures, TDD, mocking, async and integration tests.

MITAuto-check passedTesting & QA

Install Python Testing

skills CLI

$ npx skills add athola/claude-night-market --skill python-testing -a claude-code

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

GitHub CLI

$ gh skill install athola/claude-night-market python-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/athola/claude-night-market.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/parseltongue/skills/python-testing .claude/skills/python-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 "python-testing" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/parseltongue/skills/python-testing into .claude/skills/python-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "python-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/athola/claude-night-market/tree/master/plugins/parseltongue/skills/python-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 athola/claude-night-market --skill python-testing -a codex

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

GitHub CLI

$ gh skill install athola/claude-night-market python-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/athola/claude-night-market.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/parseltongue/skills/python-testing .agents/skills/python-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 "python-testing" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/parseltongue/skills/python-testing into .agents/skills/python-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "python-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 athola/claude-night-market --skill python-testing -a cursor

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

GitHub CLI

$ gh skill install athola/claude-night-market python-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/athola/claude-night-market.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/parseltongue/skills/python-testing .cursor/skills/python-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 "python-testing" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/parseltongue/skills/python-testing into .cursor/skills/python-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "python-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/athola/claude-night-market.git --path plugins/parseltongue/skills/python-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 athola/claude-night-market --skill python-testing -a gemini-cli

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

GitHub CLI

$ gh skill install athola/claude-night-market python-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/athola/claude-night-market.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/parseltongue/skills/python-testing .gemini/skills/python-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 "python-testing" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/parseltongue/skills/python-testing into .gemini/skills/python-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "python-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 athola/claude-night-market python-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 athola/claude-night-market --skill python-testing -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/parseltongue/skills/python-testing .github/skills/python-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 "python-testing" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/parseltongue/skills/python-testing into .github/skills/python-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "python-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 athola/claude-night-market --skill python-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 athola/claude-night-market python-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/athola/claude-night-market.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/parseltongue/skills/python-testing .opencode/skills/python-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 "python-testing" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/parseltongue/skills/python-testing into .opencode/skills/python-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "python-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: python-testing
GitHub stars: 342
Token cost: ~800 tokens
SKILL.md length: 275 words
Files: 7
Skills in repo: 160
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Python testing patterns with pytest, fixtures, TDD, mocking, async and integration tests.

Works in 3 steps: Dependencies: pip install pytest… → Configuration: Add the following to… → Verification: Run pytest to confirm…
Auditing a Python test suite
SKILL.md covers Quick Start, When To Use, When NOT To Use and Modules, plus 2 more sections
Calls pip and pytest

What it does

Python Testing is an agent skill from athola/claude-night-market. Python testing patterns with pytest, fixtures, TDD, mocking, async and integration tests. Use when writing or auditing a Python test suite.

Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files (for example `modules/async-testing.md`, `modules/fixtures-and-mocking.md` and `modules/test-infrastructure.md`).

It sits in Testing & QA, covering Integration testing, Test-driven development and Unit testing. It works with Python and pytest. The repository describes itself as: 23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context… The licence is MIT.

When your agent uses it

Auditing a Python test suite
Tasks that involve Integration testing
Tasks that involve Test-driven development

Example prompts

“/python-testing”

Requirements

Python 3

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

Dependencies: pip install pytest pytest-cov pytest-asyncio pytest-mock
Configuration: Add the following to pyproject.toml
Verification: Run pytest to confirm discovery of files matching test_*.py.

What it can do on your machine

Read from SKILL.md and the folder at commit 9f3eb00. 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:
- pip
- pytest
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use 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

Python Testing loads about 800 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 275 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~39
When it runs · the whole SKILL.md, loaded when a task matches: ~800

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 athola/claude-night-market at commit 9f3eb00, republished under its MIT licence (© athola). 275 words, ~800 tokens.

Download SKILL.mdSave it as .claude/skills/python-testing/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.

name: python-testing
description: Python testing patterns with pytest, fixtures, TDD, mocking, async and integration tests. Use when writing or auditing a Python test suite.
globs: **/*.py
alwaysApply: false
category: testing
tags: python, testing, pytest, tdd, test-automation, quality-assurance
usage_patterns: testing-implementation, test-suite-setup, test-refactoring, ci-cd-integration
complexity: intermediate
model_hint: standard
estimated_tokens: 900
progressive_loading: true
modules: modules/unit-testing.md, modules/fixtures-and-mocking.md, modules/test-infrastructure.md, modules/testing-workflows.md, modules/test-quality.md…

Python Testing Hub

Testing standards for pytest configuration, fixture management, and TDD implementation.

Quick Start

Dependencies: pip install pytest pytest-cov pytest-asyncio pytest-mock

Configuration: Add the following to pyproject.toml:

toml

[tool.pytest.ini_options]
testpaths = ["tests"]
addopts = "--cov=src"

Verification: Run pytest to confirm discovery of files matching test_*.py.

When To Use

Constructing unit and integration tests for Python 3.9+ projects.
Isolating external dependencies using pytest-mock or custom monkeypatching.
Validating asynchronous logic with pytest-asyncio markers and event loop management.
Configuring project-wide coverage thresholds and reporting.

When NOT To Use

Evaluating test quality - use pensive:test-review instead
Infrastructure test config - use leyline:pytest-config

Modules

This skill uses modular loading to manage the system prompt budget.

Core Implementation

See modules/unit-testing.md - AAA (Arrange-Act-Assert) pattern, basic test structure, and exception validation.
See modules/fixtures-and-mocking.md - Request-scoped fixtures, parameterization, and boundary mocking.
See modules/async-testing.md - Coroutine testing, async fixtures, and concurrency validation.

Infrastructure & Workflow

See modules/test-infrastructure.md - Directory standards, conftest.py management, and coverage tools.
See modules/testing-workflows.md - Local execution patterns and GitHub Actions integration.

Standards

See modules/test-quality.md - Identification of common anti-patterns like broad exception catching or shared state between tests.

Exit Criteria

Tests implement the AAA pattern.
Coverage reaches the 80% project minimum.
Individual tests are independent and do not rely on execution order.
Fixtures are scoped appropriately (function, class, or session) to prevent side effects.
Mocking is restricted to external system boundaries.

Troubleshooting

Test Discovery: Verify filenames match the test_*.py pattern. Use pytest --collect-only to debug discovery paths.
Import Errors: Ensure the local source directory is in the path, typically by installing in editable mode with pip install -e ..
Async Failures: Confirm that pytest-asyncio is installed and that async tests use the @pytest.mark.asyncio decorator or corresponding auto-mode configuration.

Files

SKILL.md and 6 other files in plugins/parseltongue/skills/python-testing of athola/claude-night-market.

SKILL.md
modules/async-testing.md
modules/fixtures-and-mocking.md
modules/test-infrastructure.md
modules/test-quality.md
modules/testing-workflows.md
modules/unit-testing.md

Open the folder on GitHubat commit 9f3eb00

Compare with similar skills

Python 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.

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Questions about Python Testing

What does Python Testing do?

Python testing patterns with pytest, fixtures, TDD, mocking, async and integration tests. Python Testing is an agent skill from athola/claude-night-market. Python testing patterns with pytest, fixtures, TDD, mocking, async and integration tests.

When should I use Python Testing?

Python Testing fits situations like: auditing a Python test suite; tasks that involve Integration testing; tasks that involve Test-driven development.

How do I install Python Testing in Claude Code?

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

How do I install Python Testing in Codex?

Run `npx skills add athola/claude-night-market --skill python-testing -a codex`. Or copy the skill folder (plugins/parseltongue/skills/python-testing in athola/claude-night-market) into .agents/skills/python-testing in your project. Codex loads it when a task matches its description.

Can I use Python 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 athola/claude-night-market --skill python-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/python-testing, .gemini/skills/python-testing, .github/skills/python-testing and .opencode/skills/python-testing in your project.

What does Python Testing need to run?

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

Does Python 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 Python 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 Python Testing use?

Python Testing 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 Python Testing use?

About 800 tokens (SKILL.md is roughly 3.2k 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 Python Testing?

Skills that share tags, products or a category with Python Testing: Python Testing (affaan-m/ECC, 274k stars), Python Testing Patterns (jh941213/my-cc-harness, 126 stars), TDD Guide (alirezarezvani/claude-skills, 28k stars) and TDD Guide (LeoYeAI/openclaw-master-skills, 2.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Python Testing?

athola (a GitHub user) maintains it in athola/claude-night-market, which has 342 GitHub stars. The repository holds 160 skills in this directory. The repository was last updated on October 6, 2026.

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

Install Python Testing

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Python Testing Hub

Quick Start

When To Use

When NOT To Use

Modules

Core Implementation

Infrastructure & Workflow

Standards

Exit Criteria

Troubleshooting

Files

Compare with similar skills

Similar skills

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Related

Questions about Python Testing