Browse QA Skills

Testing error handling paths including exception propagation, error boundaries, retry logic, circuit breakers, and graceful degradation.

Generate and maintain visual regression screenshot baselines with intelligent diffing, responsive breakpoint coverage, and dynamic content masking strategies

Comprehensive SQL injection testing patterns including blind SQLi, time-based, union-based, and parameterized query validation techniques.

Testing patterns for Drizzle ORM covering migration testing, query builder testing, transaction testing, and database integration testing with PostgreSQL, SQLite, and MySQL.

Author effective Cursor rules in .cursor/rules/*.mdc - YAML frontmatter (description, globs, alwaysApply), the four rule types, scoped QA rules, subagents, and structure that actually steers the model.

Generate and evaluate mutation tests to assess test suite effectiveness by introducing controlled code mutations and verifying test detection rates

Testing feature flag implementations including flag evaluation, gradual rollout verification, fallback behavior, and flag cleanup detection.

Testing retry mechanisms, circuit breakers, bulkheads, and timeout patterns for building resilient distributed systems.

Testing data pipelines including ETL validation, data quality checks, pipeline orchestration testing, and data lineage verification.

Risk-based testing approach for prioritizing test efforts based on business impact, change frequency, complexity, and historical defect patterns.

Testing patterns for Playwright AI-powered agents including the Planner, Generator, and Healer architecture for self-healing test automation, intelligent test generation, and adaptive test execution strategies.

WebSocket testing including connection lifecycle, reconnection logic, message ordering, backpressure handling, and binary frame testing.

Verify loading states, skeleton screens, spinners, and progress indicators across all data-fetching scenarios including slow networks, errors, and partial loads

Validate error boundary implementations in React and other frameworks ensuring graceful degradation, proper fallback UI rendering, and error recovery flows

Testing logging implementations including log level verification, structured logging validation, log rotation testing, and log aggregation pipeline testing.

Advanced security analysis using GitHub CodeQL to find zero-day vulnerabilities, injection flaws, and security anti-patterns in source code.

Testing serverless functions including Lambda, Cloud Functions, and Edge Functions with local emulation, cold start testing, and timeout handling.

Gate RAG pipelines in CI with versioned golden eval sets, per-metric thresholds, baseline drift detection, and a build that fails when retrieval or answer quality regresses.

Teaches the agent to structure tests with test.step, attach evidence and annotations via test.info, use soft assertions, and produce readable, debuggable Playwright HTML reports.