Testing Claude Skills
3 543 testing skills from 425 authors. They run test suites, check accessibility and catch what broke. Half of them fit into 1 799 tokens or less — that is what one costs your context window when the agent loads it. 404 ship runnable scripts rather than instructions alone. 2 of them cannot work without an MCP server, most often rube. We also found 429 copies of these same skills sitting in other people's repositories — counted once here, not 429 times.
3 543 unique 425 authors 2 updated this month 331 from vendors
Make Claude Code write and maintain end-to-end tests like a senior SDET — Playwright and Cypress flows with stable locators, the Page Object Model, fixtures, reused auth state, network mocking, and flake-free CI. Claude Code E2E testing, done right.
Comprehensive end-to-end testing methodologies and best practices covering architecture, test design, data management, flakiness prevention, and cross-browser strategies.
Email delivery testing including content verification, rendering across clients, spam score checking, link validation, and transactional email workflow testing.
Testing edge computing deployments including latency verification, edge function testing, CDN worker testing, and geo-distributed test execution.
End-to-end database testing with test containers, data seeding, cleanup strategies, transaction isolation, and production data anonymization.
Testing in ephemeral preview environments for pull requests including environment provisioning, data seeding, and automated teardown.
Enforce test quality with ESLint - eslint-plugin-jest, eslint-plugin-playwright, and eslint-plugin-testing-library rules in flat config, blocking focused tests, missing assertions, and flaky waits via a CI lint gate.
Validate error boundary implementations in React and other frameworks ensuring graceful degradation, proper fallback UI rendering, and error recovery flows
Android UI testing with Espresso framework including view matchers, actions, assertions, idling resources, and RecyclerView testing patterns.
Testing error handling paths including exception propagation, error boundaries, retry logic, circuit breakers, and graceful degradation.
Testing event sourcing patterns including event store validation, projection testing, saga orchestration, and event versioning compatibility.
Generate structured exploratory testing charters with focused missions, time-boxed sessions, risk-based areas, and standardized note-taking templates for systematic exploration
Express.js API testing with supertest, middleware testing, route handler testing, error handling verification, and authentication testing.
Generating realistic test data with Faker libraries for names, addresses, emails, dates, and domain-specific data with reproducible seed control.
FastAPI application testing with TestClient, dependency injection overrides, async testing, database testing with SQLAlchemy, and OpenAPI validation.
Testing feature flag implementations including flag evaluation, gradual rollout verification, fallback behavior, and flag cleanup detection.
Validate the first-time user experience including onboarding flows, empty states, tutorial completion, progressive disclosure, and initial setup wizards
Comprehensive file upload testing including format validation, size limits, malware scanning, storage verification, and concurrent upload handling.
Diagnose flaky test failures from Playwright reports, traces, and rerun history. Classify each failure as product, test, environment, data, or unknown with cited evidence and a proposed fix. Never auto-modifies code without opt-in.
Detect, quarantine, and systematically fix flaky tests with automated retry analysis, root cause categorization, and CI pipeline integration for test reliability
High-performance load testing using Gatling with Scala/Java DSL for simulating thousands of concurrent users and analyzing response time distributions.
Exhaustive testing of form validation logic including boundary values, injection payloads, encoding edge cases, and client-server validation bypass techniques
Flutter app testing with widget tests, integration tests, golden tests, Mockito, bloc testing, and Flutter Driver for end-to-end scenarios.
Flask application testing with test client, fixture patterns, SQLAlchemy model testing, blueprint testing, and Flask-specific extension testing.
Frontend performance testing covering bundle size analysis, render performance, animation frame rate, React re-render detection, and lazy loading verification.
Test automation with Gauge framework using Markdown specifications, step implementations in Java/Python/JavaScript/Ruby/C#, concepts, data-driven testing, and living documentation.
Testing GDPR compliance requirements including data deletion, consent management, data portability, right to erasure, and privacy policy enforcement.
Browser automation testing with Geb framework for Groovy/JVM using jQuery-like content DSL, Page Object pattern, Spock integration, and WebDriver abstraction.
Setting up and optimizing test pipelines in GitHub Actions with caching, parallel execution, matrix builds, and test result reporting.
Go testing with testing package, table-driven tests, subtests, benchmarks, test fixtures, httptest, and testify assertions.
Golden file testing pattern for comparing output against approved baselines with update workflows, diff tools, and version control integration.
Testing GraphQL subscriptions including WebSocket lifecycle, real-time event delivery, authorization on subscriptions, and connection management.
gRPC service testing including protobuf validation, streaming tests, error handling, deadline testing, and load testing for gRPC endpoints.
Comprehensive GraphQL API testing including query/mutation testing, schema validation, resolver testing, subscription testing, and N+1 query detection.
Testing HIPAA compliance for healthcare applications including PHI handling, audit logging, access controls, and data encryption verification.
i18n testing covering locale switching, date/number formatting, RTL layout, plural forms, ICU messages, and translation completeness verification.
Testing image processing pipelines including format conversion, resize quality, metadata handling, watermark verification, and thumbnail generation.
Integration testing strategies including database integration, external service integration, message queue testing, and test container patterns.
IoT device testing including firmware validation, protocol testing (MQTT, CoAP), power consumption testing, and over-the-air update verification.
Detecting and testing infrastructure drift between desired state and actual state using automated scanning, alerting, and remediation patterns.
BDD-style JavaScript testing with Jasmine covering spies, async patterns, custom matchers, clock manipulation, and comprehensive test organization for frontend and Node.js applications.
Modern JavaScript testing strategies with Jest, Mocha, and testing best practices covering unit testing, integration testing, mocking, async patterns, and DOM testing.
Apply classic test design techniques the ISTQB way, equivalence partitioning, boundary value analysis, decision tables, state transition testing, and pairwise combinations, to derive minimal high-coverage test sets from requirements.
Teaches the agent the right way to mock in Jest — jest.fn, mockImplementation, mockResolvedValue, jest.mock factories, spyOn with restore, and isolating modules like axios.
Run QA work in Jira like a professional, bug lifecycle and triage, JQL queries for testers, quality dashboards, sprint QA rituals, and REST API automation for bulk bug operations and reporting.
Unit testing skill using Jest for TypeScript and JavaScript, covering mocking, spies, snapshots, coverage, async testing, and custom matchers.
Load and performance testing skill using Apache JMeter, covering test plans, thread groups, assertions, listeners, timers, and distributed testing.
Production-grade Java unit and integration testing with JUnit 5 covering assertions, parameterized tests, lifecycle hooks, Mockito mocking, nested tests, and extensions.