Testing Claude Skills
3 546 testing skills from 425 authors. They run test suites, check accessibility and catch what broke. Half of them fit into 1 796 tokens or less — that is what one costs your context window when the agent loads it. 405 ship runnable scripts rather than instructions alone. 2 of them cannot work without an MCP server, most often rube. We also found 403 copies of these same skills sitting in other people's repositories — counted once here, not 403 times.
3 546 unique 425 authors 2 161 updated this month 331 from vendors
Comprehensive guide to test doubles including mocks, stubs, spies, fakes, and dummies with when-to-use guidelines and anti-pattern avoidance.
Master the Test-Driven Development approach with Red-Green-Refactor cycles, writing tests before code, comprehensive coverage patterns, and quality code practices for building robust, maintainable software.
Managing test environments including provisioning, configuration, data seeding, isolation, cleanup, and environment-as-code patterns.
Test fixture design patterns including builders, factories, object mothers, and fixture management for maintainable test data setup.
Detecting and diagnosing flaky tests using statistical analysis, execution recording, environmental factor isolation, and quarantine strategies.
Building hermetic tests that are fully isolated from external dependencies using fakes, containers, and deterministic time/random sources.
Analyzing code changes to determine which tests are impacted, enabling selective test execution and faster CI feedback loops.
Test isolation techniques including database cleanup, transaction rollback, parallel test execution, and shared resource management.
Test framework migration skill covering strategies for migrating between testing frameworks including Selenium to Playwright, Jest to Vitest, Enzyme to React Testing Library, and Protractor to Cypress with automated codemods and incremental migration patterns.
Implementing test observability with execution analytics, failure trend analysis, coverage gap detection, and test suite health dashboards.
Data-driven testing with parameterized tests, test matrices, combinatorial testing, and pairwise parameter generation techniques.
Test plan generation skill covering requirements analysis, test strategy, coverage matrices, risk-based testing, and test estimation techniques.
Comprehensive test strategy design methodology covering risk-based testing, test pyramid optimization, coverage planning, environment strategy, data management, and test automation ROI analysis for enterprise and startup contexts.
Optimizing test suite execution speed with parallelization, test splitting, caching, selective test execution, and test impact analysis.
Comprehensive TestCafe end-to-end testing skill for writing reliable browser automation tests in JavaScript and TypeScript without WebDriver dependencies, featuring smart assertions, automatic waiting, and parallel execution.
Docker-based integration testing with Testcontainers for databases, message queues, cloud services, and custom containers with lifecycle management.
Safe testing-in-production strategies including feature flags, shadow traffic, canary releases, dark launches, and observability-driven development.
Advanced Java testing with TestNG covering data providers, parallel execution, test groups, XML suite configuration, listeners, soft assertions, and dependency management.
Organize testing in TestRail, suite and section architecture, writing maintainable cases, test runs and plans, milestone reporting, and TestRail API automation to push automated results into one quality view.
End-to-end test automation using testRigor's plain English syntax for writing maintainable tests without coding, covering cross-browser testing, mobile testing, API validation, and integrations with CI/CD pipelines.
Find timezone-related bugs in date handling, scheduling, and display logic by testing across multiple timezones and edge cases like DST transitions.
End-to-end type-safe API testing with tRPC covering router testing, middleware testing, subscription testing, and client-server integration testing patterns
Testing patterns for Turborepo and pnpm monorepos covering workspace dependency testing, affected package detection, parallel test execution, and shared test utilities
Generate high-signal unit tests for existing code, behavior-first case selection, boundary and error paths, mocking discipline, mutation-tested quality, and framework-idiomatic output for Vitest, Jest, and pytest.
Testing patterns for Vercel Edge Functions, middleware, and serverless functions covering local testing, edge runtime simulation, and deployment verification.
Natural language test automation methodology where tests are written as plain English instructions, leveraging AI agents to interpret intent, generate executable tests, and maintain test suites without traditional code-based selectors or assertions.
Visual regression testing skill using Playwright, covering screenshot comparison, visual diff thresholds, responsive testing, baseline management, and CI integration.
Teaches the agent to migrate a Jest suite to Vitest — vi.mock and the globals shim, vitest.config workspaces/projects, coverage, browser mode, and Vitest v4 breaking changes.
Write fast unit and integration tests with Vitest — vitest.config.ts setup, vi.fn and vi.mock module mocking, fake timers, snapshots, V8 coverage with thresholds, workspaces for monorepos, and in-source testing.
Modern JavaScript and TypeScript testing with Vitest, covering unit testing, integration testing, mocking, snapshots, browser mode, and Vite integration.
Testing voice-activated applications including speech recognition accuracy, intent detection, dialog flow testing, and multi-language support.
Vue.js component testing using Vue Test Utils with mount/shallow mount, event simulation, Vuex/Pinia store testing, and composition API testing.
Test Vue 3 components with Vue Test Utils and Vitest — mount vs shallowMount, finding and triggering DOM, asserting props and emitted events, awaiting async updates, and mocking Pinia stores and Vue Router.
Testing WebAssembly modules including compilation verification, memory management, interop testing, and performance benchmarking of WASM components.
Automated WCAG 2.2 AA/AAA compliance testing with axe-core, Pa11y, and manual testing patterns for keyboard navigation, screen readers, and color contrast.
Testing and monitoring Core Web Vitals (LCP, FID, CLS, INP, TTFB) to ensure web performance meets Google search ranking thresholds.
Anthropic's official web application testing skill using native Python Playwright scripts with helper utilities for server lifecycle management, browser automation, and comprehensive E2E testing workflows.
Build WebdriverIO E2E suites — wdio.conf.ts setup, $ and $$ selectors, auto-wait and waitUntil, Mocha framework structure, page objects, parallel capabilities, and services for visual testing and Appium mobile.
Comprehensive WebDriverIO (WDIO) test automation skill for generating reliable end-to-end browser tests in JavaScript and TypeScript with Page Object Model, custom commands, and advanced synchronization strategies.
Testing webhook implementations including delivery verification, retry logic, signature validation, idempotency, and failure handling patterns.
WebSocket testing including connection lifecycle, reconnection logic, message ordering, backpressure handling, and binary frame testing.
API simulation and service virtualization with WireMock for HTTP stubbing, request matching, stateful behavior, and fault injection testing.
iOS UI testing with XCUITest framework covering element queries, gesture simulation, accessibility testing, and Xcode test plan configuration.
Teach agents to manage Jira test cases and executions with Xray and Zephyr, including issue modeling, JQL, and CI result publishing through REST APIs.
Cross-site scripting vulnerability testing covering reflected, stored, and DOM-based XSS with sanitization validation and CSP bypass detection.
Comprehensive xUnit.net testing skill for writing reliable unit, integration, and acceptance tests in C# with [Fact], [Theory], fixtures, dependency injection, and parallel execution strategies.
Writing and testing YARA rules for malware detection, threat hunting, and file classification with rule validation and false-positive rate testing.
Comprehensive testing patterns for Zod schemas covering validation testing, transform testing, error message verification, and integration with API endpoints and forms