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Agent skill

Nextjs Testing

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Write Jest or Vitest unit tests with React Testing Library and Playwright E2E tests for Next.js projects.

MITAuto-check passedTesting & QA

Install Nextjs Testing

skills CLI
$ npx skills add HoangNguyen0403/agent-skills-standard --skill nextjs-testing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard nextjs-testing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/HoangNguyen0403/agent-skills-standard.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/nextjs/nextjs-testing .claude/skills/nextjs-testing && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
nextjs-testing
GitHub stars
572
Token cost
~768 tokens
SKILL.md length
314 words
Files
3 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Write Jest or Vitest unit tests with React Testing Library and Playwright E2E tests for Next.js projects.

  • Works in 5 steps: Write unit tests — Use Jest (or Vitest… → Mock APIs for unit/component tests — Set… → Test interactions — Use userEvent… → …
  • Testing components with RTL
  • SKILL.md covers Priority: P1 (HIGH), Test Runner, Workflow: Test New Feature and Component Test Example, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Nextjs Testing is an agent skill from HoangNguyen0403/agent-skills-standard. Write Jest or Vitest unit tests with React Testing Library and Playwright E2E tests for Next.js projects. Use when testing components with RTL, mocking APIs with MSW, or creating Playwright user flow tests.

Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/implementation.md`).

It sits in Testing & QA, covering Unit testing. It works with Next.js, Playwright, Jest and Vitest. The repository describes itself as: A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages. The licence is MIT.

When your agent uses it

  • Testing components with RTL
  • Mocking APIs with MSW
  • Creating Playwright user flow tests

Example prompts

  • “/nextjs-testing”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Write unit tests — Use Jest (or Vitest for new projects) + RTL with Arrange-Act-Assert pattern.
  2. Mock APIs for unit/component tests — Set up MSW handlers for fetch boundaries in isolated tests where network determinism is required.
  3. Test interactions — Use userEvent (async) for clicks, typing, form submissions.
  4. Add E2E tests — Use Playwright for critical user flows (login, checkout).
  5. Verify coverage — Rely on risk-weighted behavioral verification and project-configured CI coverage gates; never write padding tests to hit…

What it can do on your machine

Read from SKILL.md and the folder at commit b529c2d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nextjs Testing loads about 768 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 55 tokens; SKILL.md has 314 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~55
When it runs · the whole SKILL.md, loaded when a task matches
~768
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from HoangNguyen0403/agent-skills-standard at commit b529c2d, republished under its MIT licence (© HoangNguyen0403). 314 words, ~768 tokens.

Download SKILL.mdSave it as .claude/skills/nextjs-testing/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
nextjs-testing
description
Write Jest or Vitest unit tests with React Testing Library and Playwright E2E tests for Next.js projects. Use when testing components with RTL, mocking APIs with MSW, or creating Playwright user flow tests.

Next.js Testing

Priority: P1 (HIGH)

Test Runner

  • Existing projects (Pages Router / legacy stack): Use Jest (jest@29 + babel-jest + jest-environment-jsdom).
  • New projects (App Router): Use Vitest for speed and native ESM support.

Workflow: Test New Feature

  1. Write unit tests — Use Jest (or Vitest for new projects) + RTL with Arrange-Act-Assert pattern.
  2. Mock APIs for unit/component tests — Set up MSW handlers for fetch boundaries in isolated tests where network determinism is required.
  3. Test interactions — Use userEvent (async) for clicks, typing, form submissions.
  4. Add E2E tests — Use Playwright for critical user flows (login, checkout).
  5. Verify coverage — Rely on risk-weighted behavioral verification and project-configured CI coverage gates; never write padding tests to hit an arbitrary percentage.

Component Test Example

See implementation examples

Implementation Guidelines

  • Unit Testing: Use Jest (existing projects) or Vitest (new projects) with React Testing Library (RTL). Follow Arrange-Act-Assert (AAA) patterns.
  • E2E Testing: Use Playwright for full user flow validation. Focus on critical flows (Login, Checkout).
  • Networking: Intercept API boundaries using Mock Service Worker (MSW) for isolated component/unit tests to guarantee deterministic fixtures; allow intentional real-network or staging coverage in dedicated Playwright E2E/contract suites. Ensure server and browser handlers are correctly configured.
  • Interactions: Use userEvent (async) to simulate user actions: await user.click(button).
  • Selectors: Favor getByRole / findByRole to test accessibility. Use data-testid only as fallback.
  • Environment: For Jest, use jest-environment-jsdom. For Vitest, configure vitest.config.ts with jsdom or happy-dom.
  • Reporting: Ensure tests generate JSON coverage reports for CI gates. Verify risk-weighted behavioral paths rather than padding code to reach arbitrary percentage targets.

Anti-Patterns

  • No unisolated network in unit tests: Use MSW handlers or fakes for unit/component tests; do not perform uncontrolled external network calls outside dedicated E2E suites.
  • No implementation testing: Test user behavior, not internal methods.
  • No heavy E2E for unit logic: Use Jest/Vitest for isolated logic tests.
  • No global state leakage: Reset MSW handlers and mocks after each test.

References

© HoangNguyen0403, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/nextjs/nextjs-testing of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/implementation.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

Nextjs Testing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

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Works with

Categories

Questions about Nextjs Testing

What does Nextjs Testing do?

Write Jest or Vitest unit tests with React Testing Library and Playwright E2E tests for Next.js projects. Nextjs Testing is an agent skill from HoangNguyen0403/agent-skills-standard.js projects.

When should I use Nextjs Testing?

Nextjs Testing fits situations like: testing components with RTL; mocking APIs with MSW; creating Playwright user flow tests.

How do I install Nextjs Testing in Claude Code?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill nextjs-testing -a claude-code`. Or copy the skill folder (skills/nextjs/nextjs-testing in HoangNguyen0403/agent-skills-standard) into .claude/skills/nextjs-testing in your project. Claude Code loads it when a task matches its description.

How do I install Nextjs Testing in Codex?

Run `npx skills add HoangNguyen0403/agent-skills-standard --skill nextjs-testing -a codex`. Or copy the skill folder (skills/nextjs/nextjs-testing in HoangNguyen0403/agent-skills-standard) into .agents/skills/nextjs-testing in your project. Codex loads it when a task matches its description.

Can I use Nextjs Testing in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HoangNguyen0403/agent-skills-standard --skill nextjs-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nextjs-testing, .gemini/skills/nextjs-testing, .github/skills/nextjs-testing and .opencode/skills/nextjs-testing in your project.

What does Nextjs Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Nextjs Testing is instructions for the agent only.

Does Nextjs Testing access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Nextjs Testing safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Nextjs Testing use?

Nextjs Testing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Nextjs Testing use?

About 768 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 356 tokens, read only when the agent opens those files.

What are the alternatives to Nextjs Testing?

Skills that share tags, products or a category with Nextjs Testing: Playwright Testing (chongdashu/vibejam-starter-pack, 149 stars), React Testing (affaan-m/ECC, 277k stars), Senior QA (alirezarezvani/claude-skills, 28k stars) and Test Commander (EliasOulkadi/shokunin, 114 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nextjs Testing?

HoangNguyen0403 (a GitHub user) maintains it in HoangNguyen0403/agent-skills-standard, which has 572 GitHub stars. The repository holds 211 skills in this directory. The repository was last updated on October 9, 2026.

Source: HoangNguyen0403/agent-skills-standard on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.