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Javascript Testing Patterns

Checked
yunseo-kim·vlatest·backend

Helps with JavaScript, testing, patterns as part of developing backend services and APIs workflows.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add yunseo-kim/agent-toolbox --skill javascript-testing-patterns -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

yunseo-kim

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned yunseo-kim/awesome-agent-toolbox at acc29835cf.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
acc29835cf
Manifest
.agents/skills/javascript-testing-patterns/SKILL.md
Scanned
2 files, 986 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill provides guidance and examples for implementing common JavaScript testing patterns. It helps ensure code quality through techniques like mocking, test doubles, and assertion strategies. The goal is to create robust and maintainable tests that accurately reflect the behavior of your JavaScript applications.

When to use it

  • When you need help writing unit tests for a new JavaScript module or component.
  • To refactor existing tests that are brittle or difficult to understand.
  • For guidance on how to effectively mock dependencies in your tests.
  • When facing challenges with testing asynchronous code or complex logic.

Key capabilities

  • Guidance on mocking techniques.
  • Examples of test doubles (stubs, spies, fakes).
  • Assertion strategies for verifying expected behavior.
  • Patterns for testing asynchronous JavaScript code.

Example prompts

  • "Show me an example of how to mock a function in Jest."
  • "What are some common patterns for testing asynchronous functions in Javascript?"
  • “Explain the difference between a stub and a spy when writing tests.”

Tips & gotchas

This skill assumes you have a basic understanding of JavaScript and testing frameworks like Jest or Mocha. The effectiveness of this skill depends on your ability to apply the suggested patterns to your specific code context.