testing▌

Modern TypeScript testing with Vite-native speed, ESM-first design, and instant HMR feedback. \n \n Vite-powered test execution delivers 10-100x faster performance than Jest through HMR-based test running and native ES module support \n Built-in TypeScript support requires zero configuration; includes Jest-compatible API for straightforward migration from existing test suites \n Supports React and Vue component testing via Testing Library and Vue Test Utils, with jsdom/happy-dom environment opti

End-to-end testing focused on real user behavior, minimal mocking, and avoiding component unit tests. \n \n Prioritizes E2E tests over unit tests; reserves unit tests for pure functions only \n Emphasizes accessible selectors (role-based, label-based) over CSS selectors and test IDs in E2E tests \n Recommends writing E2E tests instead of heavily mocked unit tests; suggests 3+ mocks as a signal to switch approaches \n Includes rules for test structure, selector strategy, and when to apply each te

Testing patterns with Pest: Arrange-Act-Assert, proper mocking, null drivers, declarative factories.

Comprehensive testing framework for shell scripts using Bats with patterns, fixtures, and CI/CD integration. \n \n Covers core Bats concepts including test syntax, assertion patterns for exit codes and output, and setup/teardown lifecycle management \n Provides mocking and stubbing strategies for external commands, functions, and environment variables to isolate units under test \n Includes fixture management patterns, error condition testing, and shell compatibility validation across bash, sh,

Developer guide for extending Playwright MCP tools and CLI commands. \n \n Add new MCP tools in packages/playwright/src/mcp/browser/tools/ , register in tools.ts , and define capabilities in config.d.ts \n CLI commands map to MCP tools; register new commands in packages/playwright/src/mcp/terminal/commands.ts and update help generator if adding a category \n Config options require updates across program.ts (CLI option), config.d.ts (definition), and config.ts (implementation and environment mapp

Backtest crypto and traditional trading strategies against historical market data. \n \n Includes 8 pre-built strategies (SMA, EMA, RSI, MACD, Bollinger Bands, Breakout, Mean Reversion, Momentum) with customizable parameters \n Calculates comprehensive performance metrics: Sharpe, Sortino, Calmar ratios, max drawdown, VaR, volatility, win rate, and profit factor \n Supports parameter grid search optimization to find best-performing configurations across strategy parameters \n Generates trade-by-

Use this skill when the user needs Apex test execution and failure analysis: running tests, checking coverage, interpreting failures, improving coverage, and managing a disciplined test-fix loop for Salesforce code.

Guides systematic root-cause debugging for tests, builds, and unexpected errors.

Tests in real browsers using Chrome DevTools MCP for debugging and inspecting web applications.

Provide systematic methodologies for automated SQL injection detection and exploitation using SQLMap. This skill covers database enumeration, table and column discovery, data extraction, multiple target specification methods, and advanced exploitation techniques for MySQL, PostgreSQL, MSSQL, Oracle, and other database management systems.