Jest

Analyze assertion quality, depth, variety, and false confidence in existing tests.

microsoft/testfx

Explains how the @handsontable/react-wrapper package is built, from its components and settings mapping to selection handling and the generated TypeScript declarations.

handsontable/handsontable

Explains how to run and write tests for Handsontable's Walkontable rendering engine, which has its own Jasmine, Puppeteer and Jest pipelines apart from the main E2E tests.

handsontable/handsontable

The test-driven development workflow for ZettelFlow — write a failing test first, run jest, use the Obsidian mock and the bare-specifier alias mappings, and know which code is unit-testable.

RafaelGB/Obsidian-ZettelFlow

Nest.js framework expert specializing in module architecture, dependency injection, middleware, guards, interceptors, testing with Jest/Supertest, TypeORM/Mongoose integration, and Passport.js…

davila7/claude-code-templates

Implement comprehensive testing strategies with pytest, fixtures, mocking, and test-driven development.

jh941213/my-cc-harness

Applies proven testing patterns — Arrange-Act-Assert (AAA), Given-When-Then, Test Data Builders, Object Mother, parameterized tests, fixtures, spies, and test doubles — to help write maintainable…

rohitg00/skillkit

Add or update Jest unit tests for fe-tools utilities. An agent skill from MichealWayne/fe-tools.

MichealWayne/fe-tools

React component testing with React Testing Library, Vitest/Jest, MSW for network mocking, accessibility assertions with axe, and the decision boundary between component tests and Playwright/Cypress…

affaan-m/ECC

Diagnose and fix tests that pass in isolation but fail when run concurrently.

rileyhilliard/claude-essentials

Guides test strategy for unit, integration, and E2E testing.

DanielPodolsky/ownyourcode

ALWAYS USE for test work that requires changes: write, add, generate, repair, or strengthen tests for existing code in xUnit, MSTest, NUnit, pytest, Vitest/Jest, Go, or another framework.

microsoft/testfx

Helps write unit tests for UUI components using Jest, jsdom, and @epam/uui-test-utils.

epam/UUI

Generates unit tests, integration tests, and E2E tests for React/Next.js applications.

alirezarezvani/claude-skills

Automatically suggest tests for new functions and components.

alirezarezvani/claude-code-tresor

Write adversarial test cases that break production code instead of producing false confidence.

theexperiencecompany/gaia

Quality standards for Salesforce Lightning Web Components (LWC), Aura components, and Visualforce pages.

github/awesome-copilot

React 18.3.1 and React 19 dependency compatibility matrix. An agent skill from github/awesome-copilot.

github/awesome-copilot

Generates Jest unit and integration tests in JavaScript or TypeScript.

sickn33/agentic-awesome-skills

Generates Vitest tests in JavaScript/TypeScript with Vite-native speed.

sickn33/agentic-awesome-skills

Test-driven development skill for writing unit tests, generating test fixtures and mocks, analyzing coverage gaps, and guiding red-green-refactor workflows across Jest, Pytest, JUnit, Vitest, and…

alirezarezvani/claude-skills

Write and run automated tests with Jest and Testing Library in the browser.

live-codes/livecodes

Autonomous maintenance routine that root-causes intermittently failing CI tests — mining GitHub Actions history for same-commit red-to-green reruns, reproducing locally with repeated runs, fixing…

bex-co/beancount-io

Set up Vitest testing in any project — detects type (Cloudflare Workers, React, Node, library), generates vitest.config.ts, test setup, utilities, and a sample test.

jezweb/claude-skills

Lightning Web Components with PICKLES methodology and 165-point scoring.

Jaganpro/sf-skills

Apex test execution, coverage analysis, and test-fix loops with 120-point scoring.

Jaganpro/sf-skills

Generate failing tests for the TDD red phase to define expected behavior and edge cases.

aiskillstore/marketplace

Generate unit, integration, E2E, and visual regression tests following the Testing Trophy methodology (80% integration).

EliasOulkadi/shokunin

A skill your agent uses when writing a Storybook story for a component gated on a feature flag — boolean flags or multivariate/experiment-arm variants.

PostHog/posthog

Best practices for writing JavaScript/TypeScript tests using Jest, including mocking strategies, test structure, and common patterns.

github/awesome-copilot

Apex test execution, coverage analysis, and test-fix loops with 120-point scoring.

forcedotcom/sf-skills

E2E test automation using agent-browser CLI. An agent skill from jh941213/my-cc-harness.

jh941213/my-cc-harness

Write unit and integration tests for Ledger Wallet apps. An agent skill from LedgerHQ/ledger-live.

LedgerHQ/ledger-live

A skill your agent uses for anything about testing FrontMCP servers: writing or running unit, integration, and E2E tests and reaching the 95%+ coverage bar.

agentfront/frontmcp

Guides an agent through reproducing, root-causing, fixing, and validating flaky tests in the PostHog monorepo.

PostHog/posthog

Testing patterns for Jest and Playwright. An agent skill from bybren-llc/safe-agentic-workflow.

bybren-llc/safe-agentic-workflow

Testing patterns for Jest and Playwright. An agent skill from bybren-llc/safe-agentic-workflow.

bybren-llc/safe-agentic-workflow

Test or validate Supercheck changes using package checks, Jest, Playwright UI/API E2E, recorder browser tests, contract tests, AI SRE acceptance, release evidence, and commit/merge readiness gates.

supercheck-io/supercheck

Gates whether a new test should exist and forces it to be efficient, protecting CI from low-value test bloat.

PostHog/posthog

Parse build errors, test failures, type-check output, and validation logs into structured data.

maslennikov-ig/claude-code-orchestrator-kit

Test-driven development skill for writing unit tests, generating test fixtures and mocks, analyzing coverage gaps, and guiding red-green-refactor workflows across Jest, Pytest, JUnit, Vitest, and…

LeoYeAI/openclaw-master-skills

Long-term technology stack review using State of JS, State of CSS, and Thoughtworks Technology Radar — satisfaction×usage matrix, ADOPT/TRIAL/ASSESS/HOLD mapping, P0–P3 migration priority.

mizchi/skills

TypeScript strict mode with eslint and jest. An agent skill from alinaqi/maggy.

alinaqi/maggy

Generate mocks, stubs, spies, and fakes for dependency isolation.

jeremylongshore/tons-of-skills-marketplace

Test automatically generate comprehensive unit tests from source code covering happy paths, edge cases, and error conditions.

jeremylongshore/tons-of-skills-marketplace

Create and validate component snapshots for UI regression testing.

jeremylongshore/tons-of-skills-marketplace

Unit testing skill using Jest for TypeScript and JavaScript, covering mocking, spies, snapshots, coverage, async testing, and custom matchers.

PramodDutta/qaskills

Increase test coverage to 90% on a target zone with iterative writing and refactoring

LedgerHQ/ledger-live