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Vitest 3 Features

Checked
josiahsiegel·vlatest·testing·MIT

Automates Vitest tests, ensuring JavaScript component functionality aligns with specified features and expectations.

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 josiahsiegel/claude-plugin-marketplace --skill vitest-3-features -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

josiahsiegel

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 josiahsiegel/claude-plugin-marketplace at 5a1b1123b9.

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

Commit
5a1b1123b9
Manifest
plugins/test-master/skills/vitest-3-features/SKILL.md
Scanned
1 file, 522 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 comprehensive knowledge of Vitest 3.x features and modern testing patterns, focusing on improvements released since January 2025. It enables AI agents to automate Vitest tests, specifically leveraging new capabilities like the Annotation API, Line Number Filtering, and Enhanced Watch Mode for JavaScript component functionality. The skill also includes guidelines for file path handling on Windows systems.

When to use it

  • When needing to add custom metadata, messages, or attachments to test results (e.g., debugging information, links to external resources).
  • To execute specific tests directly from an IDE by line number.
  • For faster and more accurate test execution during development with improved change detection in watch mode.
  • When working on Windows systems and needing to ensure correct file path formatting.

Key capabilities

  • Annotation API: Allows adding custom metadata, messages, and attachments to tests for reporting across various formats (UI, HTML, JUnit, TAP, GitHub Actions).
  • Line Number Filtering: Enables running specific tests by their line number within a file.
  • Enhanced Watch Mode: Provides smarter change detection, faster rebuilds, and improved file watching, especially on Windows.
  • Windows File Path Handling: Enforces the use of backslashes (\) in file paths when using Edit or Write tools on Windows systems.

Example prompts

  • "Add an annotation to this test indicating it's testing OAuth2 flow with external provider and attach the oauthConfig."
  • "Run the test located at line 42 of tests/user.test.js."
  • "How do I configure watch mode in Vitest?"

Tips & gotchas

  • Windows File Paths: Always use backslashes (\) when specifying file paths on Windows systems within Edit or Write tools. For example, D:\repos\project\file.tsx instead of D:/repos/project/file.tsx.
  • Documentation: The skill prioritizes updating existing documentation rather than creating new files.