# Testing > Use for Jest, Playwright e2e, API tests, and bundler smoke tests in contentstack-typescript. Use when this capability is needed. - Skill: `tomevault-io/testing-74` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/testing-74` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/testing-74/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Integrations & APIs - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/testing-74 --- # Testing – contentstack-typescript ## When to use - Adding or fixing tests under `test/unit`, `test/api`, or browser/e2e flows - Investigating failures in `test/bundlers` or Playwright ## Instructions ### Layers - **Unit**: `npm run test:unit` → `jest ./test/unit`. - **API**: `npm run test:api` — may require stack credentials via env files (see project docs and `.gitignore`). - **Browser**: `npm run test:browser` uses a dedicated Jest config. - **E2E**: `npm run test:e2e` builds a browser bundle then runs Playwright—slower; run before large release changes. - **Bundlers**: `test/bundlers/` exercises webpack/vite/rollup/next/esbuild—run `npm run validate:bundlers` when changing packaging. ### Hygiene - Do not commit secrets or live tokens; use fixtures or CI secrets only where documented. --- > Source: [contentstack/contentstack-typescript](https://github.com/contentstack/contentstack-typescript) — distributed by [TomeVault](https://tomevault.io).