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Agent skill

Nestjs Testing

by HoangNguyen0403 in HoangNguyen0403/agent-skills-standard

Write Unit and E2E tests with Jest, mocking strategies, and database isolation in NestJS.

MITAuto-check passedTesting & QA

Install Nestjs Testing

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

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

GitHub CLI
$ gh skill install HoangNguyen0403/agent-skills-standard nestjs-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/nestjs/nestjs-testing .claude/skills/nestjs-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
nestjs-testing
GitHub stars
572
Token cost
~1k tokens
SKILL.md length
423 words
Files
5 (incl. references)
Skills in repo
211
Repo updated
First seen
Licence
MIT

At a glance

Write Unit and E2E tests with Jest, mocking strategies, and database isolation in NestJS.

  • Writing NestJS unit tests
  • SKILL.md covers Priority: P2 (MEDIUM), Core Rule Anchors, Structure and Unit Testing, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • E2E tests with supertest

What it does

Nestjs Testing is an agent skill from HoangNguyen0403/agent-skills-standard. Write Unit and E2E tests with Jest, mocking strategies, and database isolation in NestJS. Use when writing NestJS unit tests, E2E tests with supertest, or mock providers.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `evals/evals.json`, `references/improve-coverage.md` and `references/patterns.md`).

It sits in Testing & QA, covering Unit testing and End-to-end testing. It works with NestJS and Jest. 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

  • Writing NestJS unit tests
  • E2E tests with supertest

Example prompts

  • “/nestjs-testing”

Requirements

  • Docker

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

Nestjs Testing loads about 1k tokens when it runs, and up to ~4.9k if it reads all its reference files. Until then it costs about 46 tokens; SKILL.md has 423 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.9k

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). 423 words, ~1,026 tokens.

Download SKILL.mdSave it as .claude/skills/nestjs-testing/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
nestjs-testing
description
Write Unit and E2E tests with Jest, mocking strategies, and database isolation in NestJS. Use when writing NestJS unit tests, E2E tests with supertest, or mock providers.

NestJS Testing

Priority: P2 (MEDIUM)

Core Rule Anchors

  • [BE-TEST-01] Parameterized Tests for Equivalent Cases: Prefer test.each when methods have multiple equivalent inputs or boundary permutations. Distinct scenarios may stay separate test functions. Reviewers must not demand parameterized rewrites without a behavioral gap.
  • [BE-TEST-02] Ban on Brittle DB Mock String Matching: Do not use string-matching mocks for raw SQL queries. Test pure domain calculations directly, or use a real test DB for repository verification.
  • [BE-TEST-03] Ban on Shallow Assertions: Never assert only expect(res).toBeDefined() without inspecting payload fields, status codes, and invariants.
  • [BE-TEST-04] Ban on Pass-Through Interface Mocks: Repositories and service handlers must test contract compliance and error mapping. Ban 1:1 pass-through mock echoing without contract assertions.
  • [BE-TEST-05] Bug-First Regression Lock: Every PR fixing a bug ticket or with title fix(...) must introduce a test reproducing the defect prior to the fix.

Structure

src/**/*.spec.ts      # Unit tests (isolated logic)
test/**/*.e2e-spec.ts # E2E tests (full app flows)

Unit Testing

  • Setup & Mocks ([BE-TEST-04]): Use Test.createTestingModule() with mocked providers. Ban 1:1 pass-through mock echoing.
  • Pattern & Cleanup: AAA (Arrange-Act-Assert). Call jest.clearAllMocks() in afterEach.
  • Assertions ([BE-TEST-03]): Avoid shallow assertions like expect(res).toBeDefined(). Verify payload invariants.
  • Coverage: Coverage is diagnostic and project-configured; verify risk-weighted critical paths rather than padding code for an arbitrary percentage.

E2E Testing

  • Database ([BE-TEST-02]): Use real test DB (Docker). Never mock DB in E2E.
  • Cleanup: Mandatory. Use transaction rollback or TRUNCATE in afterEach.
  • App Init: Create app in beforeAll, close in afterAll.
  • Guards: Override via .overrideGuard(X).useValue({ canActivate: () => true }).
Show full SKILL.md (193 more words)Show less

Strict TypeScript (MANDATORY)

  • No any: Use typed objects, jest.Mocked<T>, or as unknown as T. Never as any.
  • No eslint-disable: Fix underlying type issue. No exceptions.
  • Verify DTO shapes: Read actual DTO class before writing mock data.
  • Cast Jest matchers: Nested expect.anything() → expect.anything() as unknown.
  • No unused vars: Only declare variables if referenced in assertions or setup.

Anti-Patterns

  • [BE-TEST-01] Stylistic parameterized rewrites: Do not demand test.each rewrites without a behavioral gap.
  • [BE-TEST-02] Brittle DB mock string matching: Do not match SQL strings in mocks; use real DB.
  • [BE-TEST-03] Shallow assertions: Ban shallow assertions like expect(res).toBeDefined().
  • [BE-TEST-04] Pass-through mock echoing: Ban 1:1 mock echoing without contract assertions.
  • [BE-TEST-05] Bug fix without reproduction test: Ban bug fixes without a reproduction test.
  • No Private Tests: Test via public methods, not service['privateMethod']. Never write tests for private methods solely to satisfy coverage targets.
  • No DB Mocks in E2E: Use real DB with cleanup. Mocks defeat E2E purpose.
  • No Shared State: Call jest.clearAllMocks() in afterEach. Random failures otherwise.
  • No Resource Leaks: Always close app and DB in afterAll.

References

Setup examples, mocking patterns, E2E flows, test builders, coverage config: references/patterns.md

Strict-TypeScript patterns (Jest matchers, mock typing, DTO verification): references/strict-typescript-testing.md

© 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 4 other files (references) in skills/nestjs/nestjs-testing of HoangNguyen0403/agent-skills-standard.

  • SKILL.md
  • evals/evals.json
  • references/improve-coverage.md
  • references/patterns.md
  • references/strict-typescript-testing.md

Open the folder on GitHubat commit b529c2d

Compare with similar skills

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Playwright Testingchongdashu/vibejam-starter-pack149—~2.1kAutomated safety check: PassNone
Playwright Testingchongdashu/vibejam-starter-pack149—~2.2kAutomated safety check: PassNone
Test Specialisttravisjneuman/.claude100—~3.7kAutomated safety check: PassMIT

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Works with

Categories

Questions about Nestjs Testing

What does Nestjs Testing do?

Write Unit and E2E tests with Jest, mocking strategies, and database isolation in NestJS. Nestjs Testing is an agent skill from HoangNguyen0403/agent-skills-standard. Write Unit and E2E tests with Jest, mocking strategies, and database isolation in NestJS.

When should I use Nestjs Testing?

Nestjs Testing fits situations like: writing NestJS unit tests; E2E tests with supertest.

How do I install Nestjs Testing in Claude Code?

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

How do I install Nestjs Testing in Codex?

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

Can I use Nestjs 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 nestjs-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/nestjs-testing, .gemini/skills/nestjs-testing, .github/skills/nestjs-testing and .opencode/skills/nestjs-testing in your project.

What does Nestjs Testing need to run?

SKILL.md names no scripts, command-line tools or credentials: Nestjs Testing is instructions for the agent only. Our summary lists: Docker.

Does Nestjs 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 Nestjs 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 Nestjs Testing use?

Nestjs 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 Nestjs Testing use?

About 1k tokens (SKILL.md is roughly 4.1k 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 3.9k tokens, read only when the agent opens those files.

What are the alternatives to Nestjs Testing?

Skills that share tags, products or a category with Nestjs Testing: Nestjs Expert (davila7/claude-code-templates, 33k stars), Designing Tests (CloudAI-X/claude-workflow-v2, 1.4k stars), Playwright Testing (chongdashu/vibejam-starter-pack, 149 stars) and Playwright Testing (chongdashu/vibejam-starter-pack, 149 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nestjs 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.