Work with pytest-recording (VCR.py) for recording and replaying HTTP interactions in tests. Use when writing VCR tests, managing cassettes, configuring VCR options, filtering sensitive data, or debugging recorded HTTP responses.
Guide for using pytest-mock plugin to write tests with mocking. Use when writing pytest tests that need mocking, patching, spying, or stubbing. Covers mocker fixture usage, patch methods, spy/stub patterns, and assertion helpers.
Write and run tests for React Native apps using Jest and React Native Testing Library. Use when creating tests, debugging failures, or setting up test infrastructure.
Control a Playwright browser via CLI - navigate, interact, and screenshot
Create and run unit tests following the project's architecture and guidelines (Robolectric, naming, location).
Use when writing tests for backend APIs or frontend flows. Triggers for: unit tests, integration tests, E2E tests, pytest fixtures, TestClient setup, mock data factories, or test coverage analysis. NOT for: testing business logic that doesn't involve API endpoints.
Validates that code actually works through sandbox testing, execution verification, and systematic debugging. Use this skill after code generation or modification to ensure functionality is genuine rather than assumed. The skill creates isolated test environments, executes code with realistic inputs, identifies bugs through systematic analysis, and applies best practices to fix issues without breaking existing functionality.
Gate 6 - Verify tests exist and cover critical paths. Issues result in WARNINGS (encourages tests, doesn't block).
Custom test patterns and fixtures for {project}. Covers E2E, integration, and specialized testing requirements.
Cross-language testing strategies and patterns. Triggers on: test pyramid, unit test, integration test, e2e test, TDD, BDD, test coverage, mocking strategy, test doubles, test isolation.
Comprehensive testing workflow combining TDD, real implementations (no mocking), and E2E testing. Use when implementing features, writing tests, or setting up test infrastructure.
Browser automation using Playwright MCP. Navigate websites, fill forms, click elements, take screenshots, and extract data. Use when tasks require web browsing, form submission, web scraping, UI testing, or any browser interaction.
Use when implementing new features. Enforces TDD workflow - write tests FIRST, then implementation. Ensures AAA pattern, proper coverage, and quality test design.
Vitest testing patterns and strategies for unit tests, agent tests, and API tests with Supabase mocking
Validates that code actually works through sandbox testing, execution verification, and systematic debugging. Use this skill after code generation or modification to ensure functionality is genuine rather than assumed. The skill creates isolated test environments, executes code with realistic inputs, identifies bugs through systematic analysis, and applies best practices to fix issues without breaking existing functionality. This ensures code delivers its intended behavior reliably.
Integration and E2E test design principles, ROI calculation, test skeleton specification, and review criteria. Use when designing integration tests, E2E tests, or reviewing test quality.
