Pytest Testing

pluginagentmarketplace/custom-plugin-python

This is a learning-focused skill that teaches you pytest fundamentals rather than a testing utility. It covers the usual pytest curriculum: fixtures, mocking, TDD workflows, and coverage measurement. Good if you're picking up pytest for the first time or need a structured refresher on testing patterns. The skill targets integration with CI/CD pipelines too, which is where pytest knowledge actually pays off in production codebases. It's passed security audits through Gen Agent Trust Hub, Socket, and Snyk. If you already know pytest well, this probably won't add much, but it's solid for getting up to speed on Python testing practices.

GitHub stars: 6
last updated: Aug 21, 2026

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Install

$ npx -y skills add pluginagentmarketplace/custom-plugin-python --skill 'Pytest Testing' --agent claude-code

Installs into .claude/skills of the current project.

Files

Pytest Testing

Overview

Master software testing with pytest, Python's most popular testing framework. Learn test-driven development (TDD), write maintainable tests, and ensure code quality through comprehensive testing strategies.

Learning Objectives

Write unit, integration, and functional tests with pytest
Use fixtures for test setup and teardown
Mock external dependencies effectively
Implement test-driven development (TDD)
Measure and improve code coverage
Integrate tests with CI/CD pipelines

Core Topics

1. Pytest Basics

Test discovery and naming conventions
Assertions and comparison
Test organization (files, classes, modules)
Running tests (command-line options)
Markers and test selection
Parametrized tests

Code Example:

# test_calculator.py
import pytest

def add(a, b):
    return a + b

def divide(a, b):
    if b == 0:
        raise ValueError("Cannot divide by zero")
    return a / b

# Basic test
def test_add():
    assert add(2, 3) == 5
    assert add(-1, 1) == 0
    assert add(0, 0) == 0

SKILL.md on GitHub