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testing-patterns

Explain testing pyramid, AAA pattern, and mocking strategies for test suites.

Updated Feb 6, 2026
Search Tags:#testing#integration test#unit test#e2e test#mocking#test patterns
One-click install
npx skills add https://github.com/ntuan2502/piggy --skill testing-patterns-ntuan2502
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: testing-patterns
Source: https://github.com/ntuan2502/piggy/tree/main/.agent/skills/testing-patterns
Command: npx skills add https://github.com/ntuan2502/piggy --skill testing-patterns-ntuan2502

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the challenge of creating reliable, maintainable, and effective test suites by providing clear principles and patterns for unit, integration, and end-to-end testing.

Core Features & Use Cases

  • Testing Pyramid: Understand the ideal distribution of test types.
  • AAA Pattern: Structure tests for clarity and repeatability.
  • Mocking Strategies: Learn when and how to use mocks effectively.
  • Use Case: A developer can use this Skill to learn how to properly mock external API calls in their unit tests, ensuring faster execution and better isolation of the code under test.

Quick Start

Explain the principles of the testing pyramid.

Frequently Asked Questions about testing-patterns

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

FAQPage Schema
What is the testing pyramid and how does it structure unit, integration, and E2E tests?▼

The testing pyramid structures your test suite by prioritizing a large base of fast unit tests, fewer integration tests, and a minimal number of slow E2E tests. This distribution ensures fast, maintainable, and reliable feedback throughout development.

How do I use the AAA pattern to structure unit tests?▼

The AAA pattern structures unit tests into Arrange, Act, and Assert phases. This separation clarifies test setup, execution, and verification, making your tests highly readable, repeatable, and self-checking for robust test suites.

What are the best mocking strategies for isolating external API calls in integration tests?▼

Mocking strategies for external API calls involve replacing real dependencies with simulated objects to ensure fast, isolated tests. Proper mocking prevents network latency and flakiness, allowing you to verify code behavior without relying on external services.

When should I write integration tests versus end-to-end tests?▼

Write integration tests to verify interactions between multiple modules or services, and reserve E2E tests for validating complete user journeys through the entire application. Balancing both ensures comprehensive coverage while keeping test execution fast and maintainable.

Why do my unit tests fail to run quickly and how can I make them self-checking?▼

Unit tests run slowly when they lack isolation or depend on external systems. By applying principles for fast, isolated, repeatable, and self-checking tests, you can ensure tests automatically verify outcomes without manual intervention or network delays.

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