pytest SKILL.md skillA

pytest from codeatcode/oss-ai-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add codeatcode/oss-ai-skills/pytest@v3.0.0

Pins v3.0.0 in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
codeatcode/oss-ai-skills
Path
frameworks/pytest/SKILL.md
Versions recorded
10
Latest version
v3.0.0, committed Oct 28, 2026
First version recorded
Mar 27, 2026
Size
14,618 bytes
Repository stars
30
License
GPL-3.0

Use when writing Python tests with pytest - fixtures, parametrization, markers, conftest layout, pytest-asyncio, pytest-django, coverage with pytest-cov, mocking with pytest-mock, parallel runs with xdist, mutation testing with mutmut, or CI integration.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

> **Objective:** Use this skill to prevent false-positive tests and fragile test suites by enforcing fixture discipline, exact-value assertions, and mutation-testing validation of assertion quality.

# pytest

Complete reference for Python testing with pytest.

## Overview

pytest is a mature, full-featured Python testing framework that makes it easy to write simple and scalable tests.

**Key Features:**
- Simple: Write tests with plain assert statements
- Powerful: Fixtures for setup/teardown
- Parametrized: Run same test with different inputs
- Plugins: Rich ecosystem of plugins
- Parallel: Run tests in parallel with pytest-xdist
- Detailed: Informative failure messages

### Installation

```bash
pip install pytest>=9.0
pip install pytest-cov>=5.0      # Coverage
pip install pytest-mock     # Mocking
pip install pytest-asyncio>=0.25 # Async tests
pip install pytest-django>=4.8   # Django testing
pip install pytest-xdist    # Parallel execution
```

### Python Version Requirements

pytest 9.0 requires **Python 3.10+**. Python 3.9 is no longer supported.

### Breaking Changes in pytest 9.0

**Errors from previously deprecated behavior:**
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add codeatcode/oss-ai-skills/pytest@sha256:93c8d38fc020d231

The line at the top of this page pins the label v3.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_mfv4qemlfbsheeon.svg)](https://markdownregistry.com/a/art_mfv4qemlfbsheeon)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 10 versions of this file, between Mar 27, 2026 and Oct 28, 2026, about one every 24 days.

versioncommittedcommitsizeaudit
v3.0.0 latest2026-10-28 83beb90 14,618 BA view · diff
v3.0.02026-10-08 911b6a6 14,405 BA view · diff
v3.0.02026-10-05 fc705fe 13,626 BA view · diff
v3.0.02026-10-01 268819e 13,271 BA view · diff
v3.0.02026-09-23 f8bf298 13,270 BA view · diff
v2.0.02026-08-06 30e0453 35,461 BA view · diff
v1.0.02026-07-09 a354eee 34,838 BA view · diff
v1.0.02026-04-20 e5744c4 31,488 BA view · diff
v1.0.02026-04-02 f476daf 31,498 BA view · diff
v1.0.02026-03-27 cd64152 20,798 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (14618 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

codeatcode/oss-ai-skills · 30 stars · license GPL-3.0 · pushed 2026-10-28 · branch master

API

GET https://markdownregistry.com/api/v1/artifacts/art_mfv4qemlfbsheeon
GET https://markdownregistry.com/api/v1/resolve?ref=codeatcode/oss-ai-skills/pytest
GET https://markdownregistry.com/api/v1/blob/93c8d38fc020d231e0ab30ae9ffe38a5d2c1fe481ef056088ac159161a651ab6

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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