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Property Based Testing

Checked
trailofbits·vlatest·testing·CC-BY-SA-4.0

Automatically generates test cases based on formal property specifications to uncover subtle software defects.

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 trailofbits/skills --skill property-based-testing -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

trailofbits

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 trailofbits/skills at 82fe822625.

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

Commit
82fe822625
Manifest
plugins/property-based-testing/skills/property-based-testing/SKILL.md
Scanned
8 files, 751 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

The property-based testing skill enables AI agents to generate and execute tests based on general properties rather than specific test cases. This allows for more comprehensive validation of code by automatically creating a wide range of inputs to check if certain behaviors hold true under various conditions.

When to use it

  • You need to verify that a function behaves correctly across a large number of input scenarios.
  • You want to find edge cases or unexpected failures in your code without manually writing test cases for each possibility.
  • Your project requires robust testing strategies that go beyond traditional unit tests, especially for complex logic or data transformations.

Key capabilities

  • Automatically generates test inputs based on defined properties.
  • Executes tests across a wide range of values to ensure correctness.
  • Helps identify corner cases and potential bugs in code logic.

Example prompts

  • "Generate property-based tests for the sort function to verify it always returns a sorted list."
  • "Test the validate_email function with various input formats to ensure it correctly identifies valid emails."
  • "Use property-based testing to check that the add function is commutative across all integer inputs."

Tips & gotchas

  • Ensure your properties are well-defined and cover meaningful aspects of the code’s behavior.
  • Be aware that some properties may be computationally expensive or take longer to run due to the large number of generated test cases.