Unit Testing

Create or update Fake test doubles for TypeScript interfaces. Use when user asks to "create a fake", "update a fake", "generate test fake", "fix fake", "manage fake", or mentions needing a fake for testing. Generates Initializer interface, Fake class, and Builder class following the testing pattern with getMockingFunction, FakeEntity inheritance, and EventBroker support.

how to approach tests, types and coverage

Visual QA gate for frontend code. ALWAYS use before delivering any UI changes - navigate, screenshot, verify console is error-free. Use for: responsive testing across viewports, form/interaction testing, debugging hydration and render issues. Catches visual bugs before users see them.

Professional skill creation with research-driven workflow and automated validation.USE WHEN: Creating new skills, validating existing skills, deciding between Skills vs Subagents, migrating documents to skills, or running individual validation tools.PRIMARY TRIGGERS: "create skill" = Full creation (12 steps with research + execution planning) "validate skill" = Validation workflow (steps 3-8) "Skills vs Subagents" = Decision workflow (step 0) "convert doc to skill" = Migration workflow "estimate tokens" = Token optimization "security scan" = Security auditWORKFLOW COMPLIANCE: Structured workflows with validation checkpoints. Research phase (Step 1c-1d) ensures skills based on proven approaches.DIFFERENTIATOR: Research-driven creation. Web search (3-5 queries) before building. Multi-proposal generation. 9 automation scripts. Quality 9.0+/10.REUSED: Anthropic's init_skill.py and package_skill.py (production-tested).

Testing specialist for Novel-Engine. Knows exact commands for running backend and frontend tests.

Network utility for reading and writing data across TCP/UDP connections, port scanning, file transfers, and backdoor communication channels. Use when: (1) Testing network connectivity and port availability, (2) Creating reverse shells and bind shells for authorized penetration testing, (3) Transferring files between systems in restricted environments, (4) Banner grabbing and service enumeration, (5) Establishing covert communication channels, (6) Testing firewall rules and network segmentation.

Advanced password recovery and hash cracking tool supporting multiple algorithms and attack modes. Use when: (1) Performing authorized password auditing and security assessments, (2) Recovering passwords from captured hashes in forensic investigations, (3) Testing password policy strength and complexity, (4) Validating encryption implementations, (5) Conducting security research on cryptographic hash functions, (6) Demonstrating password weakness in penetration testing reports.

Type-safe API development with Hono framework. Covers route chaining for type inference, factory patterns, Zod OpenAPI integration, error handling, RPC client, and testing patterns. Use when building APIs with Hono, using hc client, or when Hono, RPC, OpenAPI, or --hono flag mentioned.

Generates Jest or Pytest tests following Ben's testing standards. Use when creating tests, adding test coverage, writing unit tests, mocking dependencies, or when user mentions testing, test cases, Jest, Pytest, fixtures, assertions, or coverage.

This skill is for writing integrations to the Ruby SDK. Claude acts as the engineer implementing LLM provider or agentic framework integrations. Use when adding support for OpenAI-like providers, Anthropic-like providers, or agent frameworks. Covers TDD workflow, comprehensive testing (streaming/non-streaming/tokens/multimodal), defensive coding, MCP validation, and StandardRB compliance.

Use CDP at localhost:9222 to test/debug websites, automate browser tasks

Use when running builds, executing tests, or improving developer experience workflows - provides structured guidance for build/test execution and DX improvement.

A comprehensive guide to best practices in Swift 6+, covering architecture, concurrency, UI development, code style, dependencies, performance, and testing.

Master skill for TypeScript backend development. Decision framework for APIs (tRPC/REST), authentication (Auth.js/Passport), database (Prisma), validation (Zod), logging (Pino), testing (Vitest), and deployment (Docker). Routes to specialized skills for implementation. Use as entry point for any backend task.

This skill generates self-contained p5.js celebration animations for educational MicroSims. Use this skill when users request creating new celebration animations, particle effects, reward animations, or visual feedback for student achievements. The skill creates a new animation JavaScript file in /docs/sims/shared/animations/ and integrates it with the animation-lib-tester MicroSim for testing.

Provides battle-tested error handling patterns for TypeScript and Python. Use when implementing error handling, creating try/catch blocks, or handling exceptions.

Generate conventional commit messages for jj by analyzing diffs, running tests first, and handling immutable commits

Strategic testing framework: testing pyramid, test design patterns, anti-patterns. Complements tdd-enforcement (tactical) with comprehensive strategy.

Automated SQL injection detection and exploitation tool for web application security testing. Use when: (1) Testing web applications for SQL injection vulnerabilities in authorized assessments, (2) Exploiting SQL injection flaws to demonstrate impact, (3) Extracting database information for security validation, (4) Bypassing authentication mechanisms through SQL injection, (5) Identifying vulnerable parameters in web requests, (6) Automating database enumeration and data extraction.

Multi-agent parallel E2E validation workflow for database refactors and system migrations. Use when validating QuestDB deployments, schema migrations, bulk data ingestion pipelines, or any database-centric refactor requiring comprehensive testing across environment, data flow, and query layers.