Unit Testing

This skill enables Claude to generate realistic test data and database seed scripts for development and testing environments. It uses Faker libraries to create realistic data, maintains relational integrity, and allows configurable data volumes. Use this skill when you need to quickly populate a database with sample data for development, testing, or demonstration purposes. The skill is triggered by phrases like "seed database", "generate test data", "create seed script", or "populate database with realistic data".

This skill enables Claude to automatically generate comprehensive unit tests from source code. It is triggered when the user requests unit tests, test cases, or test suites for specific files or code snippets. The skill supports multiple testing frameworks including Jest, pytest, JUnit, and others, intelligently detecting the appropriate framework or using one specified by the user. Use this skill when the user asks to "generate tests", "create unit tests", or uses the shortcut "gut" followed by a file path.

This skill analyzes code coverage metrics to identify untested code and generate comprehensive coverage reports. It is triggered when the user requests analysis of code coverage, identification of coverage gaps, or generation of coverage reports. The skill is best used to improve code quality by ensuring adequate test coverage and identifying areas for improvement. Use trigger terms like "analyze coverage", "code coverage report", "untested code", or the shortcut "cov".

This skill enables Claude to test load balancing strategies. It validates traffic distribution across backend servers, tests failover scenarios when servers become unavailable, verifies sticky sessions, and assesses health check functionality. Use this skill when the user asks to "test load balancer", "validate traffic distribution", "test failover", "verify sticky sessions", or "test health checks". It is specifically designed for testing load balancing configurations using the `load-balancer-tester` plugin.

E2EテストおよびユニットテストにおけるAPIモック技術スキル。外部API依存を排除し、テストの安定性・速度・信頼性を向上させるための手法とベストプラクティスを提供します。📖 参考資料:• 『RESTful Web APIs』（Leonard Richardson）/ 適用: APIレスポンスのモック化 / 目的: 外部API依存を排除し、テストの安定性と速度を向上させる• 『Mock Service Worker』（Artem Zakharchenko）/ 適用: ネットワークリクエストのインターセプト / 目的: 複雑なAPI統合シナリオでのテスト精度向上• 『Testing JavaScript』（Kent C. Dodds）/ 適用: エラーケース（4xx、5xx）のテスト / 目的: エラーハンドリングの包括的な検証外部APIへのテスト依存を排除したい時、エラーケースをテストしたい時、ネットワーク遅延をシミュレートしたい時、MSWによるHTTPインターセプトを実装したい時に使用します。

GoLang testing guidelines

Implement new features using TDD starting from README + Issue (following codegen-test), aligning with existing implementation conventions, and leveraging Serena MCP semantic search/editing to deliver high performance while being mindful of data races.

This skill enables Claude to manage and update snapshot tests using intelligent diff analysis and selective updates. It is triggered when the user asks to analyze snapshot failures, update snapshots, or manage snapshot tests in general. It helps distinguish intentional changes from regressions, selectively update snapshots, and validate snapshot integrity. Use this when the user mentions "snapshot tests", "update snapshots", "snapshot failures", or requests to run "/snapshot-manager" or "/sm". It supports Jest, Vitest, Playwright, and Storybook frameworks.

MemberSim generates realistic synthetic claims and payer data for testing claims processing systems, payment integrity, and benefits administration.

Domain specialist for software architecture, design patterns, code quality, and refactoring. Scope: SOLID principles, GoF design patterns, anti-patterns, code smells, clean architecture, code injection vulnerabilities, performance issues, modern language features. Excludes: infrastructure configuration, security operations beyond code injection, database design, API design, performance testing. Triggers: "SOLID", "design pattern", "refactor", "architecture", "code quality", "clean code", "factory", "singleton", "observer", "strategy", "dependency injection".

This skill runs smoke tests to verify critical application functionality. It executes pre-defined test suites that check system health, authentication, core features, and external integrations. Use this skill after deployments, upgrades, or significant configuration changes to ensure the application is operational. Trigger this skill using the terms "smoke test" or "st".

Debug and fix complex scripts by isolating side effects, extracting core logic into a controlled environment, validating behavior there, then reintegrating with minimal changes. Use this when scripts lack unit tests and are hard to reason about due to IO, environment, or orchestration complexity.

テストデータの設計・生成・隔離・クリーンアップを体系化するスキル。E2E/統合/単体テストの再現性を高め、データ依存による不安定化を防ぐ。Anchors:• Test-Driven Development: By Example / 適用: テストデータ設計 / 目的: 再現性と最小実装• Growing Object-Oriented Software, Guided by Tests / 適用: フィクスチャ設計 / 目的: 依存性の分離Trigger:Use when planning or implementing test data setup, seeding, isolation, or cleanup.test data, fixture, seeding, teardown

SOLID原則のインターフェース分離原則（ISP）を専門とするスキル。クライアントが使用しないメソッドへの依存を強制しない設計を実現する。Anchors:• 『アジャイルソフトウェア開発の奥義』（Robert C. Martin） / 適用: ISP原則の定義と実践 / 目的: クライアント固有インターフェース設計• 『Refactoring』（Martin Fowler） / 適用: Extract Interface, Decompose Interface / 目的: 段階的な分離リファクタリング• 『Test-Driven Development』（Kent Beck） / 適用: Simple Design, テスト容易性評価 / 目的: 設計品質検証Trigger:Use when detecting fat interfaces, segregating bloated interfaces, designing role-based interfaces,analyzing ISP violations, refactoring interfaces, implementing interface composition patterns,IWorkflowExecutor, IValidatable, IRetryable, empty implementation, exception throwing, conditional implementation.

Creates stable mocks for APIs, services, and UI components using MSW (Mock Service Worker), fixture conventions, and example patterns. Use for "API mocking", "MSW", "test mocks", or "service mocking".

Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides completion of development work by presenting structured options for merge, PR, or cleanup

Deploy a temporary LimaCharlie EDR agent on the local Linux or Mac OS host for testing. Downloads and runs the LC sensor in a temp directory with automatic cleanup. Use for testing detection rules, investigating sensor behavior, or development. Requires selecting or creating a LimaCharlie organization first.

Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes - four-phase framework (root cause investigation, pattern analysis, hypothesis testing, implementation) that ensures understanding before attempting solutions

This skill enables Claude to generate realistic test data for software development. It uses the test-data-generator plugin to create users, products, orders, and custom schemas for comprehensive testing. Use this skill when you need to populate databases, simulate user behavior, or create fixtures for automated tests. Trigger phrases include "generate test data", "create fake users", "populate database", "generate product data", "create test orders", or "generate data based on schema". This skill is especially useful for populating testing environments or creating sample data for demonstrations.

Pre-flight verification for scheduling constraint development. Use when adding, modifying, or testing constraints to ensure they are properly implemented, exported, registered, and tested before commit.