unit-testing

Generates deterministic unit tests adhering to AAA pattern and TDD principles.

11|2|Updated Dec 14, 2025
One-click install
npx skills add https://github.com/bkircher/skills --skill unit-testing-bkircher
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: unit-testing
Source: https://github.com/bkircher/skills/tree/main/unit-testing
Command: npx skills add https://github.com/bkircher/skills --skill unit-testing-bkircher

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers write high-quality, maintainable, and reliable unit tests that focus on behavior rather than implementation details, ensuring software correctness and reducing bugs.

Core Features & Use Cases

  • Behavior-Driven Testing: Emphasizes testing public APIs and observable outcomes.
  • AAA Pattern Enforcement: Ensures tests are structured logically (Arrange, Act, Assert).
  • Isolation & Determinism: Guides users to create tests that are independent and repeatable.
  • Use Case: When developing a new feature, use this Skill to generate unit tests that verify the feature's expected output for various inputs without testing internal logic.

Quick Start

Use the unit-testing skill to generate tests for the provided Python function.

Frequently Asked Questions about unit-testing

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

FAQPage Schema
How do I write unit tests that focus on behavior instead of implementation details?

To write behavior-driven unit tests, test public APIs and observable outcomes rather than internal logic. This ensures tests remain maintainable and robust against refactoring without breaking.

What is the AAA pattern in unit testing and how do I enforce it?

The AAA pattern structures unit tests into Arrange, Act, and Assert phases. Enforcing this logical structure ensures tests are readable and clearly separate setup from execution and verification.

How do I ensure my unit tests are deterministic and fully isolated?

Deterministic unit tests require total isolation from external systems and mutable state. By avoiding shared state and hardcoding expected values, tests become independent and repeatable across runs.

Can I use this unit testing approach with any programming language?

Yes, this approach generates readable unit tests in any programming language. It focuses on universal principles like isolation and the AAA pattern rather than relying on specific frameworks.

Why should I avoid logic in my test code when practicing TDD?

Avoiding logic in test code and hardcoding expected values improves clarity and robustness. Test code without conditional branches is easier to read and prevents bugs within the tests themselves.

When should I not use unit tests for verifying a new feature?

Unit tests should not be used when verification requires interacting with external systems or mutable state. They are designed for isolated logic and public APIs, not integration or end-to-end flows.