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
Comprehensive JWT token security testing including signature verification, expiration checks, algorithm confusion attacks, and claim validation.
Test Kafka-based event-driven systems, producer and consumer integration tests with Testcontainers, schema compatibility gates, idempotency and ordering verification, dead-letter handling, and end-to-end event flow assertions.
Performance and load testing skill using k6, covering load test scripts, thresholds, scenarios, checks, custom metrics, and results analysis.
Comprehensive Karma test runner skill for browser-based JavaScript unit testing with Jasmine, Mocha, or QUnit frameworks, real browser execution, coverage reporting, and CI/CD pipeline integration.
Kotlin testing with JUnit 5, MockK, Kotest, coroutine testing, Android testing with Espresso, and Kotlin-specific assertion libraries.
Comprehensive testing patterns for Katalon Studio including codeless record-and-playback, Groovy scripted testing, custom keywords, data-driven testing, cross-browser execution, and CI/CD integration with Katalon TestOps.
Kubernetes deployment testing including manifest validation, Helm chart testing, pod health checks, network policy testing, and rollback verification.
Instrument LLM apps with Langfuse tracing, then use traces, scores, and datasets to test in production, run evaluations on real traffic, catch regressions, and close the loop from incident to golden dataset.
Expert-level Laravel Dusk browser testing skill for PHP/Laravel applications. Covers Chrome-based E2E testing, browser assertions, Page Objects, component testing, authentication helpers, and database integration.
Laravel PHP testing with PHPUnit, feature tests, browser tests with Dusk, database factories, mocking facades, and HTTP testing helpers.
Expert-level Lettuce BDD testing skill for Python applications. Covers Gherkin feature files, step definitions, terrain hooks, Selenium integration, data-driven scenarios, and migration guidance to Behave for modern projects.
Coverage-guided fuzz testing using libFuzzer for C/C++ applications to find memory corruption, buffer overflows, and crash-inducing inputs.
Automated open-source license compliance testing to detect license conflicts, copyleft violations, and license compatibility issues in dependencies.
Testing LLM-powered features including output quality validation, hallucination detection, token usage monitoring, and prompt regression testing.
Testing load balancer configurations including health check validation, routing algorithms, session affinity, failover behavior, and SSL termination.
Security testing for LLM-powered applications including prompt injection, jailbreak detection, data leakage prevention, and AI safety testing.
Verify loading indicators, skeleton screens, and progress bars appear correctly during async operations and disappear on completion or error.
Python-based load testing with Locust for writing user behavior scripts, distributed testing, real-time web UI monitoring, and custom load shapes.
Testing logging implementations including log level verification, structured logging validation, log rotation testing, and log aggregation pipeline testing.
Black-box mobile UI testing with Maestro YAML flows - launchApp, tapOn, inputText, assertVisible, reusable runFlow subflows, environment parameters, JUnit reporting, and emulator-based CI pipelines.
AI-powered testing patterns with Mabl including auto-healing tests, visual regression, API testing, performance monitoring, CI/CD integration, and intelligent test maintenance using Mabl's machine learning capabilities.
Comprehensive testing patterns for Model Context Protocol servers including tool validation, transport testing, schema verification, and end-to-end MCP integration testing with stdio and SSE transports.
Consumer-driven contract testing for microservices using Pact, ensuring API compatibility and preventing integration breakages across service boundaries.
Accessibility testing for mobile apps including VoiceOver/TalkBack testing, touch target sizes, dynamic type support, and motor accessibility.
Scalable mobile testing using cloud device farms like AWS Device Farm, BrowserStack, and Firebase Test Lab for cross-device compatibility.
Mobile application performance testing including app launch time, frame rendering, memory profiling, battery consumption, network throttling, and crash analytics using Appium, XCTest, and Espresso with real device testing.
Test touch gestures including swipe, pinch-to-zoom, long press, and drag-and-drop on mobile viewports and touch-enabled devices.
Comprehensive Mocha testing skill for writing robust unit and integration tests in JavaScript and TypeScript with Chai assertions, Sinon mocking, async patterns, and CI/CD integration.
MongoDB testing with in-memory MongoDB, aggregation pipeline testing, schema validation, indexing verification, and replica set testing.
Microsoft's built-in .NET testing framework covering test classes, data-driven tests, assertions, lifecycle management, mocking with Moq, and integration testing for C# applications.
API mocking with Mock Service Worker for browser and Node.js environments including request interception, response simulation, and network error testing.
Mock Service Worker v2 patterns - http and graphql request handlers, setupServer for Node test runs, setupWorker for the browser, per-test handler overrides, and strict unhandled-request policies.
Testing multi-tenant application isolation including data segregation, tenant-specific configuration, cross-tenant access prevention, and performance isolation.
Generate and run mutation tests to measure test suite effectiveness by introducing code mutations and verifying detection rates.
Advanced mutation testing using Stryker, PIT, and mutmut to measure test suite quality by introducing controlled mutations and tracking kill rates.
Run mutation testing with StrykerJS for TypeScript/JavaScript and mutmut for Python to measure whether your test suite actually catches bugs, enforce mutation score thresholds, and keep runs fast with incremental mode in CI.
Comprehensive Nemo.js test automation skill for PayPal's Selenium-based Node.js testing framework featuring view-driven locators, flexible configuration, Mocha integration, and scalable browser automation patterns.
Systematically generate negative test cases covering invalid inputs, unauthorized actions, missing required fields, exceeded limits, and malformed request payloads
NestJS application testing with @nestjs/testing, dependency injection mocking, e2e testing with supertest, guard testing, and pipe validation testing.
Network latency simulation and testing for measuring application behavior under various network conditions including high latency, packet loss, and bandwidth constraints.
Next.js application testing covering Server Components, App Router, API routes, middleware, dynamic routes, and SSR/SSG testing patterns.
Comprehensive NightwatchJS end-to-end testing skill with integrated Selenium WebDriver, built-in assertions, page objects, and parallel test execution for reliable browser automation in JavaScript and TypeScript.
HTTP request mocking with Nock for Node.js testing including request intercepting, response recording, and external API simulation.
NUnit 3 constraint-based testing for C# covering Assert.That patterns, parameterized tests, setup/teardown, Moq mocking, test categories, and the fluent assertion model.
Security testing for OAuth2 implementations including authorization code flow, PKCE, token handling, redirect URI validation, and scope enforcement.
Validate progressive web app offline functionality including service worker caching, offline data persistence, sync-on-reconnect behavior, and graceful degradation
Automatically generating API tests from OpenAPI/Swagger specifications including request validation, response schema checking, and edge case generation.
Testing distributed tracing and observability instrumentation with OpenTelemetry including span verification, metric collection, and log correlation.