python-testing

Guide Python testing with pytest, TDD, fixtures, and mocking.

Updated Jul 27, 2026
One-click install
npx skills add https://github.com/kouiso/designdiff --skill python-testing-kouiso
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: python-testing
Source: https://github.com/kouiso/designdiff/tree/main/.claude/skills/python-testing
Command: npx skills add https://github.com/kouiso/designdiff --skill python-testing-kouiso

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides comprehensive strategies and patterns for writing robust, maintainable, and efficient tests for Python applications, ensuring code quality and reliability.

Core Features & Use Cases

  • Test-Driven Development (TDD): Guides you through the red-green-refactor cycle.
  • Pytest Fundamentals: Covers basic test structure, assertions, fixtures, and parametrization.
  • Advanced Techniques: Includes mocking, patching, testing async code, and exception handling.
  • Use Case: When developing a new Python feature, use this Skill to write tests first, ensuring the code meets requirements and is well-tested from the start.

Quick Start

Follow the Test-Driven Development cycle by writing a failing test, then the minimal code to pass, and finally refactoring.

Frequently Asked Questions about python-testing

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I write Python tests using pytest fixtures and parametrization?

Pytest fixtures provide a baseline for tests by setting up and tearing down resources, while parametrization allows running a single test function against multiple inputs. This Skill guides you through structuring tests, applying fixtures, and parametrizing to build comprehensive test suites.

What is Test-Driven Development (TDD) and how do I apply it in Python?

Test-Driven Development (TDD) is a methodology where you write a failing test before the functional code. This Skill guides you through the red-green-refactor cycle in Python, ensuring code meets requirements and is well-tested from the start.

How do I mock external dependencies when testing Python applications?

Mocking in Python testing is achieved using unittest.mock to replace external dependencies. This Skill provides patterns and best practices for mocking and patching, allowing you to isolate components and verify interactions within your test suites.

Can I test asynchronous Python code with pytest?

Yes, asynchronous Python code can be tested using the pytest-asyncio framework. This Skill covers async testing techniques, enabling you to write and execute tests for async functions and ensure the reliability of your asynchronous applications.

What is the best way to handle expected exceptions in pytest?

Handling expected exceptions in pytest involves asserting that specific errors are raised during test execution. This Skill covers exception handling strategies, helping you verify error conditions and build robust, maintainable test suites for your Python projects.